Discovery Bank Delaying Closure to Take more admin fees

Six days ago, I requested the closure of my Discovery Bank Credit account after paying the full outstanding amount on the settlement letter, plus an additional amount, resulting in a credit balance. Last week, I lodged a complaint because I hadn’t received any updates from Discovery Bank about the account closure or the refund of my credit. They just responded with an excuse email stating they are still within their 8-day processing period. When I called, I was told I should receive a form to complete for the credit to be transferred to my bank account, but I haven’t received this form. At this point, I’m willing to forgo the R500 credit just to have the account closed.