Im uneducated about cars did i get rip off?

If you paid him already and he did the work to your car then the only thing to do is to go to court. But that will waste so much time especially if he keeps saying hes not guilty. Did you try to talk to him and see if you two can work it out. If you don't wanna do the court stuff. Then try talking to him and hopefully hes nice enough to atleast give you your money back,