Contract cancellation

I had a month to month home wifi contract with MTN. I then decided to cancel contract with them in March where i took everything as required back to MTN store on the 13 March 2025 i was given an IRMS***. On the 15 March ( my inital payment date) i was debited i thought it was because the cancellation process was done late. Beginning of April i wrote several emails to MTN customer care requesting that they cancel my contract to my surprise April 15 i was debited again, i then went to MTN store in Howick to enquire what was happening and to request refund for April debit. While waiting for that refund i realised that 15 May i was debited again🥲🥲🥲🥲🥲 . I have tried to get assistance with MTN from emails, facebook messenger and ins tore but it seems like i am not winning with any of them.