Failure to Confirm Closure of Bank Account

I asked that my account be closed on July 4,2022 telephonically with Discovery Bank. I queried the call centre agent regarding the amount I would have to pay to liquidate the amount owed. I payed in the exact amount of ZAR 1 399-50 which Discovery acknowledged in an e-mail dated July 5,2022. Account number ***. The lady I spoke to indicated that she would send me a letter within seven (7) days to confirm that the account was paid in full. I queried why it took so long when the bank was so technologically so advanced. I require Discovery Bank to send me an e-mail to *** confirming full payment, withdrawal of any adverse credit reports. This has not transpired 9 days after payment in full.