I was transferred to Green Star Energy when Future Energy became bankrupt. I stayed with them after a year and renewed as the rates were very competitive. I had not experienced the need to contact customer service too much as I was in credit and did not need to pay too much attention to the bill. However, here are some of my experiences with this company. After I switched to a direct debit, the company instantly raised it to double the amount I had set. I left it as I assumed I would gather some credit ready for the winter. However the company has failed to generate any bills for over a year. I have contacted the customer service (Now overseas call center) to find out why and resolve the issue. To which the employees are unsure of how to help as their limited resources given to them do not help. They log a complaint and an issue only to be told that I would be contacted within 48 hours, by email as the billing department does not have a phone line! I was very patient to begin with but after waiting 4 days for a response and two weeks later still no bills and an account stating over £600 credit I am a little less patient. The last bill generated was over a year ago now and only generated last week. It is like banging my head off a brick wall. I advise to avoid at all costs.