Bad service

I'm really disappointed on MTN they have destroyed my credit score. I can't apply for credit now. I cancelled a contract with them last year May 2022. Still today they haven't canceled it and they have handed over the account.. What's more worse is i have a contract with them and they have suspended it and I'm buying each month they keep on telling me that i have to settle the second contract i canceled with them before they can open my line... MTN is use less.. Guys don't take a contract with them they will destroy your credit score