How to File an Effective Energy Supplier Complaint
When your energy supplier makes repeated errors or fails to respond, it’s easy to feel ignored. But under UK regulation, every supplier must handle complaints through a defined process, and if your complaint is filed correctly, it can’t be brushed aside. This guide explains how to raise your issue formally, step by step, so it’s logged, tracked, and resolved efficiently.
Understand What Counts as a Complaint
Any expression of dissatisfaction, whether written or verbal, counts as a complaint if it requires a supplier response. This includes billing errors, missing refunds, metering faults, contract disputes, or communication failures. The moment you state clearly that you’re unhappy with service and expect action, your supplier is obligated to log it as a formal complaint.
- Incorrect or estimated bills
- Unclear or inflated contract rates
- Failure to correct known data errors
- Repeated supply or metering faults
- Poor communication or missing responses
If your supplier has not logged your concern, request a complaint reference number in writing. This ensures your case enters their official system and starts the eight-week clock for resolution.
Collect Evidence Before You Submit
A strong complaint is built on clear, factual evidence. Before you contact your supplier, gather every document or record relevant to the issue. This helps prevent delays and makes it easier for escalation teams to verify your claim.
- Copies of recent bills and statements
- Photos of meter readings showing serial numbers
- Email correspondence and call notes
- Contract or renewal documents
- Any reference numbers already provided by the supplier
Keep your evidence chronological and factual — no speculation, just dates, figures, and responses. Energy Problems often finds that this single step shortens complaint resolution times by weeks.
Submit Your Complaint in Writing
Although suppliers must log phone complaints, always follow up in writing. Written communication creates a verifiable timeline and ensures nothing is lost. Use the supplier’s official complaints email address or online form (usually found in their Complaints Code of Practice).
Structure your complaint simply:
- State your business name, address, and account number.
- Describe the issue clearly (what went wrong and when).
- List any previous contact dates or promises made.
- Attach relevant evidence — bills, photos, or written notes.
- State what resolution you expect (e.g., corrected bill, refund, explanation).
Finish by requesting written acknowledgment and a complaint reference number. This triggers the supplier’s formal handling process.
Track Responses and Deadlines
Suppliers must acknowledge your complaint promptly, typically within five working days, and aim to resolve it within eight weeks. You can follow up politely if you receive no acknowledgment after one week. Keep a clear record of every contact.
- Save all supplier replies in one email thread.
- Record call dates, names, and reference numbers.
- Note when the eight-week period began (from your first written complaint).
If you reach eight weeks with no resolution or a “deadlock” letter stating the supplier cannot do more, you may escalate your case to the Energy Ombudsman.
Escalate Professionally When Needed
If your supplier ignores repeated follow-ups or fails to act within their published timeframe, escalation is justified. Before you go to the Ombudsman, send one final written update summarising:
- The date your complaint was first submitted
- Every response (or lack thereof) from the supplier
- Reference numbers and evidence already provided
- A clear statement that the issue remains unresolved
This final step often triggers action within the supplier’s escalation team, and if not, it becomes essential documentation for the Ombudsman review.
Avoid Common Mistakes That Delay Complaints
Many business complaints stall because they lack structure or written proof. Avoid these common pitfalls:
- Submitting multiple complaints about the same issue (confuses tracking)
- Using generic customer service channels instead of the official complaint email
- Not keeping written copies of calls or meter photos
- Requesting vague outcomes like “fix this soon” instead of clear actions
Every communication should build a clear, factual trail that shows you acted professionally and gave the supplier every chance to respond.
How Energy Problems Strengthens Your Case
Energy Problems acts as your intermediary, ensuring your complaint is structured correctly, supported by evidence, and escalated efficiently. We handle correspondence with suppliers, track timelines, and prepare Ombudsman-ready documentation if necessary.
- We prepare a professional complaint summary for submission
- We liaise with supplier complaints and resolution teams
- We ensure your complaint stays within official review deadlines
- We prepare full evidence packs for Ombudsman escalation
Our involvement ensures that no details are missed and your supplier cannot claim that information was unclear or incomplete.
When to Seek Independent Support
If your issue involves complex billing disputes, contract interpretation, or long-standing supply data problems, independent support may be needed early. Energy Problems can manage these cases directly with suppliers or prepare them for formal dispute channels.
Independent support ensures the right escalation path is used, especially if you suspect your supplier has breached its own complaint procedure or Ofgem rules.
Summary: A Complaint Filed Correctly Gets Results
A clear, factual, and well-documented complaint is far more effective than a long, emotional one. State the facts, attach the evidence, and keep the timeline visible. Most suppliers respond faster when they see a structured process and professional documentation, and when they don’t, you’re ready to escalate confidently.
If your supplier isn’t responding or your complaint keeps being “lost in the system,” contact Energy Problems for structured help. We ensure your case is logged, acknowledged, and escalated properly, saving you time and protecting your business interests.