MTN keeping me hostage in expired contract

Good afternoon

I have been trying to cancel a contract with MTN for months now to no avail. This contract was supposed to be canceled in March 2021 yet prior to this happening MTN offered me another contract which sounded like a good deal as I was spending a small fortune on their hiked data prices that they are notorious for. Big instead of them cancelling the contract they were supposed thru kept billing me and they made my two existing contracts seem like it was one account so this in turn made them stop ALL my services because I refused to pay for their mistake. Another thing is that this contract was 315 and now it has changed to 1180 and they can’t explain why the price has gone up so drastically. I emailed the mtn page and they said they’d get back to me in 24- 72 hours and they failed to do that Instead they sent me an email telling me that this was my last warning. Please hear me out I was recently retrenched and I have not had a working phone since May. MTN is keeping me hostage on a contract that was supposed to be cancelled, PLEASE I AM PLEADING for your expert Albans help. My reference number is *** and the number I am trying to (still) cancel is ***. I will only pay for the two contracts that are still active.