Do you think I can bring it to the apple store and they can do a return and rebuy on the same device?
you are correct. I was able to cancel my Apple order and order directly with ATT. TYIf you had paid in full then I would say yes. But since you are on the ATT installment plan I think the answer is no. You can’t just do a return and rebuy because after the return it will take ATT 24 hours to reset your status to show that you are eligible for another installment plan.