Do you have reciepts to show what all the garage had done or supposedly done on your car?
And yes if you start talking very loudly around other customers about how your car still isn't working after getting it serviced, you will get somebody to try and help you out

Go to another garage and get their oppinion. Take them the reciept if you still have it and ask another mechanic at another garage what their thought is on your situation.
Something I learned is whenever you are supposed to have ANY part replaced or worked on to mark it in an unconspicuous(sp) spot. That way you can see if the part was actually replaced or not. Another thing I like to do that most people don't think of, and some mechanics hate, is to watch them work on your car and to pay attention to what they are taking out and putting in your car.
Good luck and hope all works out well for you
