Incorect expiration contract date

I have been trying to get this fix multiple time , I firstly sent emails to the MTN customer care line but no ones has helped me, I went to the store with my contract in hand and still I was not helped but told I should contact the Customer service go get further assistance which I did but I have been going back and forth with the Customer care since April 2022 until today. I have been speaking to the customer care line most every day and each time I call I am told a different sorry. I contract supposed to have ended already but it hasn’t due and I’m still getting billed for the phone that I have fully paid for.