MTN Warehouse not doing anything

I have tried to cancel my upgrade done on Mondo for almost been a month. I have called Mondo customer care. And it has been said that the MTN Warehouse sould send a RMA number when they receive the phone back from DSV. Now the phone was received on the 7 th January. It is now the 29th of January. How does it take solong to send a RMA number? I am very disappointed. And would like to to get the RMA number to do an upgrade as i neede a phone in end of December.