Disgusting service from MTN

I took a 24 months cellphone contract with MTN, all payment made on time. When I tried to upgrade in November 2024, I was advised that same cannot be done as my account is with collections. I requested reasons for my account being handed over to collections when MTN consultants advise that there are no outstanding payments, I was advised to contact their Legal department. They informed me that my contract was terminated on the 31/05/2024, no explanation as to why it was terminated without my knowledge or consent. Legal advised they cannot assist me. Collections advised they cannot assist me.

I have been sent from pillar to post as my number cannot return to prepaid as they cannot cancel same.

How does a contract get terminated without the member's instruction or knowledge, on what grounds was it terminated on? I have since not received any information from MTN, besides being told that they cannot assist me. No I'm stuck with a month to month contract that should have ended on the 11/12/2024 despite sending an earlier notice that I will not be continuing with the contract.

I am utterly disgusted with MTN, having being a loyal customer for so many years.