Can a buyer start a second case if they lose a first?

[Xofttam]

Hello, I have a eBay buyer who's trying his hardest to scam me out of the money. They have now started an unauthorised transaction case here on PayPal. I have uploaded the proof of posting and tracking details but I was wondering if they lose this unauthorised case can they open another one for a different reason? Say not received or not as described? Or is one case the limit? Thanks

[sharpiemarker]

@Xofttam 

They could appeal the decision or change the case to another reason or give up and go to their credit card to dispute.