MTN Contract a ****

I took 2 contracts with MTN in 2021. 2022 I requested one contract to be cancelled and I paid a cancellation fee of R14000. They stopped debiting and I went to the store where I cancelled to ask why they are not debiting for the other contract and they said the system shows I don't owe anything. Only to find out this year that they put the money I paid on credit and never cancelled the contract as I requested. I had to call a million times being sent from pillar to post for about 3 months until I got an email that I was now on prepaid. BUT I was still billed every month for that contract I have been sending emails to retentions with no help. this morning I went to the store again only then they pick up that a wrong contract was cancelled and not the one I requested and now the account has been handed over to legal because I will not pay for something I paid a cancellation fee for. and seemingly no one can help me I spent an hour on the phone with them just now being transferred from here to there and no solution just wasted time. now they say I have to pay R10000 for a contract I paid off.