ABSA's poor customer service continues... part number infinity

On 15 August 2023, an amount of R8 859.28 was deposited into my (old) cheque account, nr *** by Sanlam GAP Cover. This account was supposed to be closed by Absa, but was not done. I sent an email to *** on 7 September 2023, requesting an urgent refund, as this money is due to the doctor. I received feedback 11 September 2023, stating that "The below matter is currently an open incident pending investigation with our technical team. At this stage, we are not permitted/able to manually intervene to correct the account. We are unable to give you a timeframe as to when it will be resolved, however will keep you updated." I followed up on 18 September 2023, 10 DAYS AGO, and have had no response. I herewith also request Absa to refund me the R8 859.28 WITH INTEREST and would appreciate feedback on this matter urgently.