FedEx label to return phone and cancel service

Hello the app will not allow me to return the phone. Two phone calls to customer service and promises to email me the label have not worked, either. I only have seven days to return, work full time, and have a disabled child at home. Why can I not get the return label and cancel the service without risking bringing my son into the store? Would they even take the phone there? I am thinking of writing my own return invoice, running into a store and leaving it on the counter with a photograph of the location and my written return documentation as proof, with my signature that I do not want it, or do I need a certified mail from the postal service?, and then filing a fraud complaint. I do not want this and should be able to return it in time somehow. A consumer should be allowed to change their mind if they are not going to use the service and never used it. I did not even port my own number. The other phone is not being used and back in the box.