If the name comes up as ''banned'' when you try to make it your account name, that means it's account bound. This means you cannot transfer the name without help from a J mod to transfer it for you.
TL'DR
Name can't be sold, this doesn't make OP a scammer, maybe he didn't know.
Stop the flame though guys, a simple report a post would suffice along with mentioning the name can't be sold.