Reading what happened to you sounded very familiar to me because my husband is a mechanic. And what happened to you happens all the time because my husband is in the same field and has worked on all makes and models for a little over ten years. Unfortunatly, the problem is things break! And many times, WE DO NOT KNOW WHEN THEY ARE GOING TO BREAK. I have heard these stories many times from my husband and as mentioned before the hardest part is proving that they messed it up. I hate to bring you bad news but chances are they did nothing wrong. For the most part....these people are experienced and they do this for a living and if the person is a qualified mechanic to put a clutch in a vehicle chances are they are qualified not to mess up your transmission. I can understand your frustration but the bottom line is it is probably just a freak occurance that you are having trouble right after it came back from the shop. My husband deals with this all the time. This has already happened to him and he has explained it the best way possible......."cars are machines with many mechanical components and sometimes we can tell when things are going bad and sometimes we dont. Sometimes the parts do not give you any warning." He has also said, "just like a battery or an alternator...when those go, often times we have no warning and the car can leave you sit." I am sorry to tell you that a car is a machine and the person who worked on your vehicle, I am sure, was a qualified mechanic. You will have a hard time doubting his judgement in court because he is a qualified expert and basically it would be your word against his. Good luck.
Marvel2, PA