Poor customer service

I contacted the Mtn call centre in Dec 2022 to terminate my contract which was due for upgrade, & to also change it to prepaid. The call centre agent suggested an alternate cheaper contract but didn't disclose the term of the contract & I assumed it was a 24 month contract. I contacted Mtn in Jan to enquire about it & spoke the call centre manageress. It took her more than 2 weeks to retrieve the recording & she eventually agreed that the agent didn't disclose the duration of the contract. She also agreed that they will change it to prepaid. To date they are still debiting my bank account which I keep on reversing & my account has been suspended. Several mails were sent to the customercare department & to date there's no response. I've decided to hand it over to my attorneys who are in the process of issuing a notification to Mtn.