Hacked account for sure. The reason he doesn't want you to change the skin is because then the real owner will realise something is wrong. These sorts are from the kind of register/login servers where all the passwords are stored in plaintext somewhere.
Supplier? Doubtful. 50% sure this is a facade and there isn't one.
Well, If you actually bought the account, you can't even change the skin and I happened to get 1 of these 'hacked' account from my supplier and it was replaced. It was entirely their fault. Now please, stop accusing me of these reasons.