Green Star Energy

Customer service is appalling and at times just downright rude. Have been waiting months for my final bill whilst my account is £1,600 in credit . Rediculously high amount to hold on account and had to stop my direct debits or they would of continued to collect more money. When I asked customer services when I would get my money back , I was told that " by the time my final bill was calculated I wouldn't be in credit " and when I said that I highly doubted my final bill would be that high I was told " well we will have to wait and see won't we " in a rude and condescending manner . I have never had to wait so long for a final bill and when I finally get it how much longer will I then have to wait for reimbursement? Quite a long time I'm guessing , judging by current standards.