I would agree to follow Darkstar advice here because the account you claim to have been sold is not only Legendary by title in the forum but also Legendary for real to this forum.
You need to provide proof that the PM is real and the only way to find out this is to hand out your account temporarily to a very trusted member of the forum.
I would do that but I wouldn't want someone to delete the pm. I'll wait for staff member to check in so they can verify this pm is 100 percent real.