WIFI cancelation

On the 30th April I went to MTN walk in store at Boxer superstore to have my WIFI canceled. I returned their router as per the request on the same day and I was given the IRMS number and the 1-504***** number and the agent told me that it will be canceled with 3 days. To my supriised I received numerous sms'ses that my contract has been canceled in 05/02/2025 then the next sms said it's not canceled. When the agent check if it's really canceled in the 6/05/2025 tshe found out that it has not been canceled and she was advised to cancel it again and she got a new IRMS number and I got an sms that it will be canceled on the 05/62025. They debited my account on the 6/052025 I mean how can they do that when I know I canceled it in the 30th April. The next thing I am gonna try to reverse the funds and they will be quick to blacklist me with ITC.MTN please cancel my account with immediate effect and return my money cause I was not happy with your product. Don't claim to have called me because you did not...you only sent me numerous sms'ses