Not closing accounts and Ignoring complaints

I closed my access facility more than a month ago and still receiving a statement daily. On the statement it shows a negative balance. The account is clearly not closed. After I was at the branch and allot of mails. Nothing has been done. It also still shows a outstanding balance on Transunion and also does not show closed there. I think the account is stuck in a closed pending state.

Can you fix this and also provide me with an official letter that states my balance is 0 and that the account is closed.

Will you also stop ignoring complaints and start resolving issues