****ed off customer

Since March i have had 1 issue after another. Their system did an update when put old bank details back onto account and try to take pymnt from wrong account when i called to point this out i asked why they didnt see for the last yr the details had been change and who authoriaed the bank details change. They try again to take money from wrong account where had to call again.. They then took money from the right account twice. And then penalised me for their mistake and when i have called to ask them to refund me they point it as a credit and when i called to say i want the money back not a credit they put as a credit again. So i must now wait again for them to escalate call and then call back once have msg to say call has been closed to find out if they have given me my money back that they shouldnt have taken in the first place becasue they messed up. This has been goong on for 3 month.. What the hell are they doing there.