Comments and Complaints

At GTC, we are committed to providing you with excellent customer service and we encourage receiving good feedback so we know we are making our customers happy. However, we appreciate that sometimes things don’t always go to plan and we want to know when this happens so that we may resolve any difficulties at the earliest opportunity. 

If you have any comments or complaints about our service, please contact our Customer Services Team:-

  • By telephone on 01359 302640 Monday to Friday 8.30am – 5.00pm.
  • By completing the online complaint form.
  • By writing to our Head Office: Energy House, Woolpit Business Park, Woolpit, Bury St Edmunds, Suffolk, IP30 9UP
  • By emailing us at

For full details of our complaint process, including how to escalate your complaint, please see our Complaint Handling and Dispute Resolution Code of Practice.

Please click here for our Guaranteed Standards Documentation for Gas or for Electricity.

We thank you in advance for any feedback that you provide.

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