Anyone have experience with returning a phone and phone contract within 14 days to t mobil?

I paid mostly in cash with only a few hundred financed I was wondering if anyone else had returned lately it’s quite a long drive for me to try to return so was curious about certain things. I paid 1000 cash how will they return my money check? I’ve read it can take 30 days to get a check? 75 dollar restock fee? The phone is too heavy due to Arthritis in the wrists and gonna go back to my old carrier. I have a few days left to return was trying to make it work. Does it have to be the same location? Should I go to an experience store or cooperate store? All of the stores from me require a few hours of driving. Thanks in advance