Hi Neena,
A buyer who doesn't make payments after order doesn't mean that he is fake or fraud. These buyers are almost 90% new to eBay or e-Commerce sites.
They might not complete the deal for various reasons like they need payment through cash on delivery which seller doesn't offer for all products.
Giving negative feedbacks to those buyer makes them feel bad experience on eBay and might not come back. Also many sellers block them through Buyer Requirements.
If the buyer doesn't respond to UPI, give them a strike as you need to get back your FVF, and leave a neutral feedback (if you wish), this will not harm their profile and also yours.
---------------
With Regards,
Navaneeth (snrama)
๐
---------------
With Regards,
Navaneeth (snrama)
๐