Really there should be No Stars whatsoever. They supplied our energy for nearly 3 years and estimated I need to pay nearly £200 a month for gas and electricity in a two person household - about 3 times what it normally is. I tried maybe 40 or 50 times to get them to test my metre and check what was going on. By phone an email. Both times I eventually spoke to someone it must have been a call centre who said someone would call back but no-one did. Not a single email reply. I eventually left them (more than two years ago) and a year after they left they claimed I owed them £690. Since they ignored me ALL the time I was a customer and I regarded what I had paid as far too muchfor nearly 3 years I decided to ignore them. A few threatening letters later I agreed a payment to settle the account with, I assume, their debt collector and demanded written communication to confirm this. This was over a year ago. Now just received a threatening letter to both take legal action against me and to report me to the credit agencies. And now I cannot even get them to respond to a phone number on the letter. This really is THE WORST customer service experience in my lifetime.