While I understand that stance, it leaves you open for exactly the same result.
I think it deplorable that so many sellers are allowed to propagate here with stolen portfolio works and paid reviews. Whether this is or not I do not know but in just about every case where people note discrepancy between portfolio quality and delivery quality, Occam’s Razor suggests, fake portfolio. As long as people buy from them, it will simply encourage them and create more of these vile people.
Would you buy a $20 Ferraggi or Porchee car and expect it to be the real deal Ferrari or Porsche? I assume not no matter how shiny the advert. So best not to do the same with freelance work - no matter what adverts or chatter in forums indicate.
A seller should always deliver what they say but that $20 Ferraggi is clearly never going to be anything more than garbage no matter how much the buyer hopes or complains. This is the core of the adage “Buyer Beware” which is a used in law. Not to say being a garbage merchant is ok, as it is not, but to remind the customer, they have responsibilities to themselves in the situation too.
Ask the seller to provide the items promised, pay and move on.