I paid someone but he does not acknowledge my payment

[Relevant]

So recently I made a purchase, after which I paid, I never heard from the seller for a long while.
So I opened a scam report and he does not acknowledge the fact that I paid him, I screenshared and showed printscreens and he still called them fake.
So to proof to him and the people of the forum to which I reported the scam, how do I show that I did in fact pay if he shows photoshopped images of my sending him a bill.

Thanks in advance, Frank.

[PayPal_Conor]

Hi Relevant, 

Welcome to our Community 

If you haven't received your item after a recent purchase, it's best to open a PayPal dispute like this: http://ow.ly/P65S5

In the UK, we offer Buyer Protection coverage for both tangible and intangible items.

Would you consider giving this a go Relevant, as this would be the best way to prove to the Seller that you've made a successful payment?

You're unable to open a PayPal dispute if a transaction doesn't exist, you see.

Conor