Paying insurance to cover a loan that does not exist.

Standard Bank has been debiting my account for a Personal Loan which I do not have. The loan I did have was paid off in March 2022. In addition I have now received a mail which reflects an increase of this insurance payment from November 15. Countless mails in the past have yielded no response or conflicting responses to my query. The bank can not stop this debit order and refers me to Standard Bank Insurance. I have just spent the last 30 minutes on my phone with no response, only music etc. Being a pensioner I feel ****** by a bank which I trusted for years while employed. Based on my fruitless efforts to get this debit order stopped I have come to the conclusion that the only way I will be able to stop this is to close my account.