Mtn contract

I have a contract with Mtn which was upgraded in November 2022 and im advised that 24 months is up (remember we are only in July 2023) and im due for upgrade or else i will incur additional charges i am then further told that this contract expired in January 2023, this change in contract happened simply because mtn has changed the systems and *******ed customers contract. I must now be inconvenienced and charged due to mtn not being consistent with the contract taken.

Upon numerous calls to mtn to gain assistance to solve this issue the call centre agent either says I'm transferring you and cuts the call or while you speaking to them they cut the call or they just continuously keep you on hold. They are by far no service champion.