Bad service delivery from MTN South africa

I have recently upgraded my contract with mtn. My new device was supposed to be delivered to me via DSV on 01/06/2022. I am now bouncing between MTN and DSV trying to get my package delivered. DSV does not want to deliver my package bc MTN did not give them the correct contact number even though I have confirmed identification. When I call MTN about sending the correct contact number to DSV, they give me the run around and tell me to contact DSV and when I contact DSV they tell me to contact MTN. There must be someone who can deal with these queries It cannot be that difficult to change a contact number when identification has been confirmed and mtn already has the correct contact number.