I would advise anyone with issues with energy providers to use this service.
After terrible experiences with British Gas customer services and complaints, throughout a 5 month period, I logged a case with the Energy Ombudsman. The site was easy to navigate, upload documents and evidence, and gave clear information of the next steps and time deadlines.
My case handler was wonderful and kept in contact regularly, providing timely updates and information. She listened patiently whilst I explained my intense frustrations and anxiety caused by the lack of service and understanding by British Gas.
I have accepted the resolution offered by the Ombudsman. Whether British Gas fulfill the requirements within the timescale is another matter.