RS2GpSeller scammed me and owes 100k proof inside

RS2GpSeller scammed me and i have proof i just couldnt get them into one vid so i got 2 links. they are both youtube but easy to tell the first one is to prove i really did do the thing:
http://www.youtube.com/watch?v=8vmgUh7PI28

and this one is the convo afterwards:
http://www.youtube.com/watch?v=vgbneVkE3hY

i would ip ban him becuase i think he is also ohthisisfun as they have same e-mail, and in the vid he said his main acct has 3k+ posts