Complaint Review: Fix-N-Smog

I took car for smog check on 10/27/17. I was told the dipstick tube had tape at the bottom (which it did, to hold the tube down to the engine) and couldn't pass without a new tube. This still cost me $29.75. I immediately bought one ($20 from VW), installed it and took the car back. They couldn't do it because it was late in the day. I brought it back 10/30/17 for a re-inspection. The mechanic accused me of cleaning the old tube and refused to pass it. He said the tube still slips in and out of the engine port (bad design from VW, not my fault). I explained it was new, but the mechanic insisted on a receipt, to proove it, and walked off. Basically, he called me a liar. I drove home to get the old tube and receipt, then, went back a 4th time. I wasn't very happy when I came back. I showed the manager and the mechanic the old tube and my receipt. I explained the dipstick tubes slip because it's a bad design from VW and that's why I needed the tape to hold it down. The mechanic didn't like my attitude (or that I proved he doesn't know what he's talking about). He said "You need to leave!" They refused to smog my car.