Contract cancellation

I had a bad experience with MTN customer service, where I went to cancel my data contract on the 7th of February 2025. Upon taking up this contract there was an amount of R560 which was paid upfront mind you this was a month to month contract. To my surprise they attempted debiting on my bank account and when I inquired about this they said that the cancellation was scheduled for March 2025 and I am now in arrears because the consultant assisting me didn’t mention all this. I don’t know why the cancellation was scheduled for March, I inquired when is the cut off date before the load a debit order to my bank they told me it’s the 15th of each month. Cancellation was requested on the 7th of February but it was loaded for March. Please help me understand why all this was not mentioned?? I wonder why I ignored all the bad reviews experienced by MTN customer when it comes to the cancellation of contract?? Please assist me with the above mentioned issue.