MTN taking my money out of my account without my consent.

I canceled my MTN contract in October 2019 and money is still being deducted from my account. It is 6 months that they are *****ing my money out of my account. They send me confirmation that it has been resolved but still taking my money. I did contact their Retentions department. What can I do? This is what they mailed me and took my money again. Good day

Thank you for your email.

Please be advised that cell phone number *** will be migrated to MTN Prepaid on the 20-04-2020. Please allow 2 to 24 hours for activation, once Activated successful, a SMS Notification will be sent.

Trust that the above is all in order

Kinds Regards

Thelma