Let down by STANDARD BANK - very disappointed.

After 10 years with this bank and this is the BAD treatment I get. I went to the Cosmo City mall branch at the beginning of this to cancel a debit order which I have been trying to stop on the app for months but with no success. I thought going to the branch will help stop this unauthorized debit order but I got shocked when the debit order STILL went through after I was advised at the branch that the debit has been cancelled and it will no longer go through. I am very disappointed and I do not know what to ANYMORE. I feel helpless and let down by the bank that I have always trusted with my money. Please refund my money back to my account immediately.