Yet another prime example for the AT&T works great for me crowd.
'When' something goes wrong with an AT&T service, you are given the runaround.
No wonder these clowns are rated dead last for customer service.
It hasn't been demonstrated that the problem is AT&T's. It's not in their system. You start the inquiries at the source (Apple). And J. D. Power rated AT&T's customer service #1 this year.
no, its the OP
it takes a few days to process a cancelled order to free up an upgrade
It can for one reason or another, but the process is supposed to be "quick" as in immediate. However, if you cancel / return more than once in a short period of time they impose a "cooling off" period where your eligibility return is delayed (like incorrect PIN attempts on your phone). Sorry, I don't have the details.