For 3 years on a Dual Fuel Fixed Term Contract with Fixed Gas Unit Rate and Fixed Electric Unit Rate and Fixed Standard Charges with Green Star Energy. I had no problems until I announced I would be leaving them at the end of the 3 year term. I asked them to provide me with a final bill which I quickly paid in full. Next I was sent an incorrect bill. I soon noticed they had worked out the new revised bill using incorrect Gas Unit Rates and incorrect Electricity Rates based on my Welcome pack three years before. Immediately, I contacted Customer Services to let them know of the errors the company had made. At this stage in proceedings I read the reviews on Trustpilot and decided to record all my future phone calls with them. (Highly recommended) It was at this point, at my request, they sent me a corrected bill. My delight was short lived after I noticed the Gas and Electricity Rates were now correct BUT both Standard Charges used were far higher than on the original Fixed Term Contract Welcome Pack. These new figures had been back dated for the entire 3 year contract. Once again I contacted Customer Services to make a Formal Complaint regarding the incorrect Revised Final Bill. I was transferred to a dedicated Complaint Handler who initially agreed that the Standard Charges shown on the bill were wrong. After talking to her Supervisor I was told the Standard Charges were correct. Obviously I didn’t agree so I informed them I was going to the Energy Ombudsman with my complaint. Green Star Energy began sending me emails that threatened me, if I didn’t pay the incorrect bill, they would be notifying bailiffs to recover the money. For 8 weeks I had to endure the threatening emails to give the company a chance to sort out my Formal Complaint. At the end of 8 weeks the company had not sorted out my complaint so I contacted the Energy Ombudsman. I sent them a copy of the Original Welcome Pack which included all the agreed Fixed Term Energy Rates and Standard Charges. I included all the sound files of my telephone conversations. Eventually the Case was found in my favour and the company was ordered to remove the incorrect second final bill and pay me compensation. The company were given six weeks to fulfill the demands. 3 days before the end of the 6 week period I had to contact the Ombudsman to report the compensation had not been paid. They immediately chased up the missing compensation and I am pleased to say the whole Case was finally closed. During this whole procedure Green Star Energy lied to me and knowingly used incorrect figures on my final bills. After having no problems for 3 years with my Fixed Term Energy Contract, the way I was treated by the company was appalling. My advice would be to avoid Green Star Energy until they begin to get excellent reviews from genuine customers showing they have changed their devious behaviour. You have been warned