Replying to Changing ESN/MEID Number?

Ok so I bought a LG Voyager off Ebay and the guy said it had a clear ESN to activate well I got it in the mail today and turns out he lied and its reported lost or stolen. Now I can't return it because the guy wont take returns and I don't want t be screwed out of 150 bones. Is there anyway POSSIBLE to change the ESN/MEID number so I can still use this phone? I will do whatever it takes to get this to work cause I don't want to lose my money. I heard something about changing the phone ID number but I have no idea what that is so any help would be awesome.