Assurant return damaged device package Empty!!

I am currently in the same boat. Two months after i shipped the damage product i get a fine for an extra $300. I call assurant and they tell me to contact carrier and file a claim. Because their shipping label had no insurance purchased, usps cant do anything and here i am going back between assurant and tmobile and the best they can do is set a payment arrangement for the extra $300 for a damaged ipad that was returned becuase they cant do anything for me. Ive been using tmobile for close to 15 years now and i think is absurd tmobile wont even look into it or try to find a solution for me.