This would be considered breach of contract
and negligent workmanship as well as breach of warranty. If they cannot fix the car in a reasonable time, and 6+ times is not reasonable, then you have the right to take the care elsewhere for repairs and sue the other shop for a refund of your money or cost of having another shop repair it correctly. If the shop refuses to agree to allow you to take it to another shop for repair and refuses to refund your money, you can take this matter to small claims court without an attorney to sue for a refund of your money paid for their negligent work as the most they are liable for is the amount of money you paid them for the improper work (unless they caused other damage which exceeds the amount you paid them).
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