assurant fraudsters

I went to usps and they told me that there's nothing they can do. My brother also just got robbed from Assurant. They told him the same thing when he turned his defective phone. I talked to T-mobile so many times about what's going on. They don't care that I'm being robbed by there own Insurance. I been a loyal customer for years. There's so many complains right now about them receiving the package but no phone. I wonder how long is T-mobile going to keep this up until they realize that Assurant is scamming there loyal customers.