They should all be set prices, and if they get it wrong they should have to refund.
Mates bitch skinned herself on boxing day one year it was a bad one across her back. The vet we normally use was out the country so had to take her to a franchised place up the road, some young girl who looked shocked at sight stitched her up. She ended up with a bad infection so went to regular vet told him what had happened he then sent an email to pet doctor place because wound was full of crap.
He treated her for free and there were quite a few visits and my mate didn't pay a thing.
I think he must have counter charged the other vet practice.