Assurant return damaged device package Empty!!

Same thing just happened to me. I got a charge for $800 on a a claim for a damaged phone I returned since May. They barely charged me in October for it. I called them the first representative said they received and scanned it but don't know why they didn't take the charge off, she said she would investigate. Called again today and they said they received it but the package was empty. I asked if the package looked damaged, she said no it did not only it was empty. She told me I have to file a claim with USPS but if this package is not insured this claim is pointless. The phone was inside the package its a fact. I asked her what if this is on their end their warehouse, did they steal it and is their footage and she said that's not available. I am so glad to read all these comments because it makes me feel at ease that it's not just happening to me but they are actually doing this. This is really wrong to do this to any person, I would never want anyone to feel this way. I pray that if they are doing something illegal that they are held accountable for it.