MTN LTE Wifi Cancelation Nightmare

I took out a LTE month to month contract with MTN in November 2023. I went instore, app****, paid the amount + prorata as well as the sim fee. Came the 4th of December 2023 tney debited my account again for the monthly fee + prorata. I went back to the store. After a long struggle they added a credit to my account. I then decided to cancel the service with them, went to the store again January 2024 spoke to Thabo who advised me in order to cancel I have to return the router. I asked him what about the 30 days notice, he said no, you can cancel anytime as ling as you return the device. He said after returning the device it takes 7 days for the cancelation. I the meantime they debited my account on the 4th of January 2024 for February subscription. I returned the router on the 1st of February 2024, keep in mind I paid for February usage already and have no use of the service as the router was returned. After numerous times contacting MTN support the service is still not canceled and MTN debited my account on the 4th of February as well as on the 6th of March again. I have tried numerous timea to resolve this matter, but to no avail. MTN has the worst customer service online as well as instore. I will never use them again or advise anyone to take a contract with them. Till date this still has not been resolved and they just keep debiting my account every month. I have spoken to so many consultants, I have mailed them, I have tried everything possible to get this canceled and stop the debit order, but no luck. Worst service ever.