BAD TREATMENT

I have had an MTN contract for more than 10 years and this year 2023 I have been trying to call MTN to cancel my contract and also been sending emails with no success. my contract was supposed to end on the 17th of January 2023 and till today it is still continuing. I took the blame for that since I only paid partially for January, and going forward I was billed while I didn't renew my contract. that's when I decided to say let me pay up this account so that they cancel it permanently. yesterday 27 March 2023 I spoke to few consultants from Mtn and I was told that I need to call today to cancel the contract. and yesterday again I even sent an email to cancel my contract even on the 8th of February 2023 I sent an email to cancel my contract. and also during December 2022 I called to cancel my contract yet I was not given any reference. today I spoke to about 6 consultants and I am being transferred from one person to another and most of them are asking me why I want to cancel and I stated my reason but still they cut the call off on my ear while I am trying to get a refence for my cancelation. I have paid everything on their invoice TO DATE and I don't want to be billed again but their *********** consults are unable to assist me with my query. I want this contract to be cancelled as in yesterday as this is not a way to be treating a loyal customer.