Ebay don't deal with it as far as I know, they say to do it via paypal (same company anyway aren't they?)
I messaged the seller via paypal and the dispute as that is how it's meant to happen, he replied via e-mail though for some reason and I just copied his reply in to the paypal dispute, said about me trying to rip him off, haha, I don't get how, it's not like I want the rack and my money too!
The fuse is what is meant to be in there, amp says 6 and the fuse is 6.3, but I don't think that makes a difference, if the fuse was replaced recently or not I'd expect it to be replaced with the same one anyway! The sale said it had been looked over recently and serviced.