Delliore Group DELLIORE GROUP They offered to pay me $1500 a month to receive packages and ship them back out with paid shipping labels they emailed to me, then I received a bill for charges from fedex about those s Internet

These work at home jobs are scams. Always have been. You were no doubt sending packages out of the country. Basically items are bought with stolen credit card #'s and sent to you. You then send the stolen items to the guy who ordered them. In short, you're a mule. The stolen items will all be traced to you and you are complicit in receiving stolen property. 
You're never going to , nor were you going to get paid.

 I have tried conacting them for the last few days and have not received a response back at all.
- You won't because this was a SCAM.  Did you really think you would earn $1500 for doing nothing more than spending a few hours a week receiving and shipping packages? 

The "pre-paid" labels they gave you were paid for on either a stolen credit card or FedEx Account Number.  As a result Fedex comes back after you because you were the one who sent it.

Just be glad if all that happens out of this is that you owe Fedex, and hope that you don't get a 4am wake-up call from your local police when they break down your door.

You were basically a "Middleman" in this scam.  The packages that were sent were probably either stolen goods or items bought with stolen credit cards/bank accounts.  These people use people like you because it gives them a physical address to send them to.  You then "reship" the items to a mail drop.  This does one thing..it makes them pretty much anonymous and the entire "paper trail" leads back to you.

Oh and as for their phone number, it was probably a throw-away cell phone.  If you trace any address they gave you it is probably a vacant lot, a private mail box, or a business that has nothing to do with this.  The names they gave you are fake.  The website was probably paid for with stolen credit cards as well.