Really ridiculous useless customer service

I am trying to close my ackermans account. Requested a settlement and paid accordingly now when asking for the paid up letter and assistance with closure, i have received several replies which did not assist my query.. at last they decided to ask 4 or 5 security questions and i got one incorrect. my account is now blocked even if i call in. to unblock it they need my Bank statement? i dont mind sending the ID but what does my Bank statement have to do with your dumb verification?