uSell BuyBackWorld.com BuyBackWorld They stole my Phone.. I sent off a iPhone 6 Plus 64 gigs to you usell Long Island New York

I sent my I phone 6+ 64g to usell and was emailed by them saying that they had received my phone and that they were going to check over my phone then issue me out a check of $55. that was the last email I received from them so after its been since October I emailed them and said where is my check they told me that my phone was missing a component in my phone and that they had recycle my phone. Never did I give them permission to just keep my phone without them sending me my money. They emailed me saying that they recycled the phone but I have did business with them before in the past and have never had a problem such as this one before. My son also has a phone that we were going to send off to them at that same time but did not receive a box. I'm thankful that they did not send the Box because I would be out of two iPhones. At this moment I just need someone to help me because I don't think that this is fair that they're ripping people off. having them send in their devices under the impression that they are going to send out a check and in regards to send an email stating that they recycled a phone that was paid over $900 for I could have just sold it for parts on Craigslist or to a phone shop I will never do business with usell again thank you for your help.