I took my car into a transmission shop for repairs. I was told that I had a refundable ( if I went through with the repairs) 89.99 diagnostic test. They determined that there was a small part that needed replacement. It took them four days to get me a quote. They had to tear apart the transmission to figure out what part was needed for 820.00. This would be refunded if I had the repairs done with them. They took four days to get back to me and told me that it would cost 3500.00 plus tax to fix. I initially gave verbal consent by giving them my driver's license. I called an hour later to cancel the work being done. They told me I couldn't. They had already ordered the parts and shipped them. I tried to talk to them last night but they could not even give me a breakdown of the expenses. He told me to come back in the morning. I went back and told them I don't want the repairs. He won't release my car until he gets the parts and is going to charge me the above fees plus shipping and 15% restocking fee before he returns my car. Can he hold my car ransom? Can he also charge me these miscellenous fees without a written signature?