Someone mentioned an application they used to extract some vobs that were bad. Let me see if I can find the post.
If I were you, I would not ask him to do it again, I'd just live with it. I would let him/her know that you are still having problems with the discs but that you consider his/her end of the deal to be done with.
edit: The software I was thinking of is called CDCheck:
http://www.softwarepatch.com/software/cd-recovery.html It might be worth a try (although since they won't play in your DVD player, I'm not sure it will help out much, but who knows).
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