It depends from case to case..
We have a scam reporting section.. Here the Mods and Middlemans will help you to get a refund.. and if the seller that have scammed you don't would give you what you have paid/or refund you.. they can ban him..
Scam Report Section: http://www.mpgh.net/forum/forumdisplay.php?f=165
If you need any help feel free to ask to me on skype
My skype: IceCube³[MPGH] (live:firecubex01)