INCORRECT SIM ONLY PLAN

In March 2020, I app**** for an MTN data only sim contract with MTN, called the My MTN 10GB-80GB for R299.00. The consultant who helped me somehow chose a 10GB plan (10GB anytime and 20GB night). I called them and inform that, i didn't apply for that and they need to listen to their calls since they are "recorded", which they did. I spoke to a lady by the name of Thobani and she said that it was definitely a mistake from their side. I could either cancel the contract and reapply or continue with the current plan. I obviously opted to cancel and not reapply, as i was not going to go through the whole application process again. To date, MTN have yet to cancel that damn contract, they are still debiting my account and I'm not getting any joy when i e-mail and inquire! I DON'T WANT TO PAY FOR THIS ANYMORE AND I NEED MTN TO CANCEL THIS PLAN. THIS IS NOT WHAT I APP**** FOR and ITS NOT MY FAULT YOUR STAFF IS ***********