I don't often have problems with buyers, but I notice with a current unpaid item, that I have options should a buyer be difficult.
This is on the dropdown when the seller clicks on Report a Buyer.
Next, tell us what happened
If your buyer hasn't paid, please open an unpaid item case.
Buyer made unreasonable demands
Buyer abused a buyer protection program
Buyer misused returns
Other problems
My buyer isn't giving me any of these difficulties, but others may be reassured to know there are options.