Mtn struggling to cancel contract.

I took out a 2 year data plan with mtn. My contract ended July 2022. My last payment was end of August. Usually you must let them know a month before the time that you want to cancel. I've been phoning for a month trying to cancel this contract. I'm phoning from my work landline since I'm not an on a mtn cellphone nr. You keep on for almost an hour to speak to someone just to find out you are on the old system and there's no one to access the old system. How is this even possible that no one can help you accessing the old system. After holding on for an hour they put you through to someone else only to get a voice mail or call just end or the next person also can't help you. If you ask for a number for someone that can access the old system they give you wrong numbers.

It's the 2nd week of trying to cancel this contract. Everyday I'm trying to cancel with no luck trying to get someone that can access the old system. What must a person do to get mtn to cancel this contract.

I even tried to email retention@mtn. I've sent them all my details all I got it an automated reply after 5 days no message from that time.

I don't know what else I can do. I already installed Fibre that cost r400 a month now I must pay a contract of r300 per month for a contract that already ended. Who can afford r700 a month just for wifi in this day and time when everything is so expensive.

I really need help just to cancel this product.