Buybackworld Dreven Holdings LLC Took my phone, bad customer service, no phone number, Internet

Buybackworld is an awful company! They took my phone and then claimed they didn't receive it!
I sent my iPhone 4 32gb in a couple of weeks ago in the packaging they provided. I included the original iPhone box and wrapped/sealed it really well. According to USPS it was received a week after I sent it. That same day I received an email saying my order was cancelled per my request. I thought it was a mistake so I kept checking the status of my order. A few days later it said cancelled.
I started emailing the company over the next few days about this and received no response. Finally after the 3rd email they replied that my package was received empty in which they blamed me for mail fraud and told me if I contacted them again their legal department would take action.
First of all they do not have a phone number listed and secondly their live chat NEVER works! Also, the package was NOT empty! I contacted USPS to verify the package info. They stated the package was delivered unopened and not damaged (they scan the package if it was damaged or opened). I continued trying to contact the company and let them know this information. I never received a response.
This was the WORST customer service experience I have ever had with a company! Now I'm out a phone (that I could have sold elsewhere) or $185 they had guaranteed me after inspection. DO NOT deal with this company, they are a SCAM! If for some reason you decide to make sure you get insurance on the package and take pics of the packaging process, etc. These people are rude, unprofessional and a SCAM!!!