MTN re-activated my account after asking them not to, and i now have listing on my credit report.

Had an account with MTN that dates back 2022. Asked them to please not re-activate my line, they re-activated, and started billing me. I have asked numerous times, but my account has been transferred to 3 different legal / debt collectors - cim_Legal, VVN and now NuDebt. I even raised this with MTN complains, however nothing. I have proof of communication and payment i made. Please close my account and remove the listing from my credit report.