inspecton and brakes

I took my van in for a state inspection and I was told my front breaks were down to less than 1/32. I ‘M a competent mechanic, but I decided to pay for service to save time. The bill came in 30 dollars over the estimate and the owner told me it was for "assorted cost". I asked what those were and the answer was floor mats and topping off the brake fluid (really!) . Now I had been sitting in the shop for 2 hours and heard him give stories to one customer after another, So I requested to see my old pads. Guess what? They all were all 3/16 (Three times the legal limit) or more! So I said that he was in the wrong and I wanted him to make it right. At first he said he’d put the old ones back, but when I said ok to this he said he’d charge the full cost anyways! Then When I said I’d take him to court he tried to rip the used parts out of my hand, hard enough to give me a small cut! Any how I’m going to court and I want to warn every one about this slimy business.