Charge for returned phone

I mailed it 9/24/25. I have called about 8 times and keep getting different stories. 2 people said they received it and it's processing. Now the last person said it wasn't received and gave me a number for Assurant. The problem is I can't get through to Assurant because when I enter my phone number it says the number can't be found and there is no other option to talk to an agent. I'm not paying for a phone I sent back months ago. 

@user_6njz03  Yeah, that's strange, once Assurant receives the phone and it they do their evaluation, if there's any issue with the value or the trade-in being rejected you get an e-mail notification of the results.

 Let's take a deeper look at your account to see if we can get this rectified for you.

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