MY WOMAN WAS SOLD WITHOUT DISTRIBUTION!!! ASSISTANCE!!!

Hello people… I have a RIESENROBLEM and am on the edge of the white glow!!! I hope someone can help me… I bought a VW Golf 3 station wagon a while ago…as a small project car so to speak… I drove to the workshop, had it checked through and in the end had some repairs made for new TÜV. (new brake hoses, spark plugs, etc.) …even in this workshop. After that I started to get financial problems and could not trigger the car any more. ll it’s 6 months… I talked to the owner of the workshop, he agreed to wait and possibly arrange a installment payment in case of emergency. I know it’s not nice and fair to let him wait so…but he agreed… As far as so good…Yesterday I look out my window and there actually drives my car! Fully registered, radio built in, bla bla bla… I fell out of all the clouds!! He also had the vehicle letter because of TÜV.. I got him sof ort called and asked for clarification…but he didn’t want to talk to me and hung up again and again!What am I supposed to do? Can he do that? Is there a law? I would be really glad about any help in our good motorist community…Please… LG Phil