My question would be in regards to the repair, is why they didn't take the vehicle for a test drive to confirm they had fixed the problem? It should have been done before they presented you with the bill.
A former friend of mine owned an auto repair shop and his work was checked out before the customer got thier bill. If they were unsure of the exact problem the customer was called and told as such. You as a customer shouldn't have to keep paying when it's clear they didn't diagnose your vehicle properly. Any further costs should be absorbed by the shop.
If you can't get satisfaction I would file a report with the Better Business Bureau.
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