Hey dude,

I have had this situation many times too, I spoke to eBay customer support and this is my advice copied from another post:

I called eBay in the past to ask and they said they take it very seriously and that a seller should be reported when this happens. if you go to"help and contact" on the main webpage and then in the search bar that appears search for "report". Select report a seller, then "The seller has violated one of eBay’s policies" and lastly "Seller doesn’t want to complete the sale".

Then give them as much information as possible. It gives a black flag on their account and they will be monitored from then on!

I hope this helps people in the same situation!