You have remedies avaible to you under the Unfair TRad PRactices act ,as well as through the Department of Justice Consumer Fraud division. You ndefintely should ocntact an attorney . DO NOT engage in self help, or tow the car away. They will ague they had aposessory lien for work they did ,and that you converted the car. Again contact a consumer fraud attorney and they will get the problem resolved.
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If you gave verbal permission for the repairs you are still liable even without a signed work order. It is common for shops to call during the repair process and get verbal permission to make changes to the original repair order. They have a lien against your car. If you pay for the work they did you would be free to remove your car. If you have a dispute with them as to the repairs you probably need to see a lawyer about your rights.
A more practical solution would be to find another mechanic and pay that mechanic to go to the shop and examine your car and the list of repairs. The mechanic may be able to help you negotiate with the repair shop if they have not been doing things correctly. You may still have to pay to extent they did legitimate repairs that you agreed to.
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