Mtn *****

I've had a contract with mtn for over 10years with no problem.. when it's time to upgrade my one number In march 2022 i am told that the contract has been extended and enquired by whom and no answer was given. I tried again in October 2022 to upgrade the line only to be told the same thing. I was transferred from mtn direct to momo only to be told they can not see who did the extension nor can they cancel it . They gave me a number for a company called provantage which I never dealt with in my life stating they are the ones that did the extension. I called this company only to be told I am not the first customer to complain and it seems there was a ********** activity done on my contract. I sent emails with all the details they required and was assured that it would be sorted out and refund done for almost a full years premiums that I've been paying for a phone that was due for upgrade long ago. Till date nothing has been resolved and the contract still shows open order due to extension .I called mtn again today as well as provantage and No one seems to be able to help or give answers!!!! I want this to be sorted out immediately and all my premiums refunded as it's almost a year later and still nothing is being done. Is this how mtn treats their customers????????