MTN Contract

I have been trying to cancel my contract with MTN from May until August 2024 where I was told it was finalized. 2 weeks ago I received communication to say I owe R250 and need to pay it before they terminate my services. I went to my nearest branch and the consultant told me that I do not have an active contract and I should call 135 and speak to a service champion. I tried calling that number with no assistance. On the 27th I received another communication to say my services have been terminated until I pay R250 towards my account, and to my surprise the contract is active again on my Bureau. How I don't know because from August until November I was not paying nor getting any communications from MTN. Can I please get assistance as to what is really happening because whenever I try to call the 135 number, I am not getting any help or explanation