EXTREMELY POOR AND DISSAPOINTING SERVICE FROM MTN

I bought a samsung S24 on 6 March 2024 ,at MTN Walmer Park, Port Elizabeth on Contract. The intial monthly fee was over R1 100.00 but l traded in my Iphone 13 and l got 419 discount on the monthly fee. I am paying via debit order and they are still deducting the full amount. I have gone to the store multiple times and l am being given the same story that the matter has been escalated to National Office . 2 Months has now passed and they still cant tell me when will they sort this problem out. Very frustrating and unacceptable .I am sure they already sold my IPhone and they are benefitting twice while I suffer paying R419 more each month which I did not budget for and I shouldnt be paying it.