No feeback

I took out a contract for my son on my name. I did an upgrade on this contract online, the 25th of Nov 2022. DSV (couriers) contacted my son on the contract number to confirm the delivery. He told them to contact me, because I need to sign for it and I am at work during the day. We did provide my work address as well for the delivery. They never contacted me, I called them from my cell number and was told then that the delivery is now on hold due to the different cell phone number I called from and a number change needs to be done my MTN. It is now a week later and no feedback. I was told by DSV to contact MTN to confirm the number change. I was then referred by MTN to contact the ignition group and was then referred by them to the Mobile Plus department. I spoke to Mfundu on the 2nd of Dec and he told me it is also not their department that needs to take care of this, but he offered to send a message through. I went to MTN shop in Strand this morning and they also couldn’t assist and gave me the details for Rewardsco. I emailed them and still no reply. I also tried to phone but the lines were busy. We will move offices in a week’s time, and I need this cell phone delivered this week otherwise the address isn’t applicable anymore.