MTN abuse of Debit order to make deductions on expired contract.

When you sign a debit order you do so in good faith that as soon as a contract expires, that the debit order will be stopped. Should you receive confirmation that the debit order has been stopped, you would expect this to be so. But if instead of stopping the D/O, the deduction amount is altered so that any block placed on it by the bank is bypassed. This may be construed to be *********. My contract with MTN expired in October 2023. I gave notice that I would not be extending it due to the poor coverage in our area. MTN confirmed that the contract was cancelled and assured me that the D/O would be stopped. Every month since October 2023, I have had to reverse deductions with repeated notices to MTN to stop the D/O. This has accrued substantial banking admin fees and taken up hours of my time and has caused serious frustration. This is no longer a simple mistake. It seems to be malicious. The solution seems to be to change banks and to ensure that MTN’s debit order is not transferred to the new account.