Just to be clear Ady, looking at the invoice, it wasn't the same seller that you purchased from, was it? If it was, it would be pretty obvious what had happened - your seller has sent your package to the other guy, and the other guy's package (addressed to you by accident) went "missing" and had the address torn off it.

In the case that it IS the same seller, his proof of posting he provided to paypal should be proof enough that he sent the wrong item - it will have a completely incorrect weight/shipping cost.

Not sure if you can file an 'item not as described' claim after having already made an 'item not received claim' though.

Sorry for all these edits to my post. It probably isn't the same seller anyway, making my whole post pointless :P

If it is the same seller though, there's two magic words I have for you.

TRADING STANDARDS!