[Porsche-O-Phile]

I don't know the details of your contract but typically you'd reject the work, giving the G.C. some period of time (under contract) to bring it up to specifications. If they don't, or do and it STILL doesn't meet standards, you can normally issue a change order after three days (legally deducting the amount from your contract amount with the G.C.) and get someone else in there to perform the work (assuming you can find someone who will do it, of course). This "Owner's Right to Carry Out Work" clause is in most standard contracts such as AIA form A201; hopefully you used some sort of boiler plate contract like that and not just a "handshake" agreement.

I feel your pain. Issues like that suck. Sorry to hear.