Why do we bother?

Had an Astra G diesel in for test last week. Failed on headlamp image incorrect, 2 brake lights not working, 3 tyres and advisory on the other one for a nail amongst others. He had decided to do all his own work and brought it back on Thursday. Said he had 4 new tyres fitted and a new headlamp. He had fitted a second hand headlamp that was now insecure and the beam image still not right. Since i was fast tracking i hadn't logged on so sent him away having only checked the headlamp.

Came back on friday around 4 o'clock. Another "new" headlamp. Beam image still all blurry. I played around with the bulb and eventually got an image i was happy with. Put the ramp up to check his "4 new tyres". He had 3 new part worn tyres fitted and switched the one with the nail in it to the other side. Checked the few other advisories that hadn't been done. Checked the brake lights. Had to push the pedal quite far to get them to come on. All brake lights now working but noticed one of the rear sidelights was now not working (headlights still on from earlier). Customer said he had bulbs in the car. At this point I just wanted rid of the car so offered to fit it for him. He needed a stop/tail bulb but only had single. Swapped one of his bulbs for a stop/tail from our stock. Rechecked the lights but now I had no brake lights. Removed the cover covering the brake light switch played about with it but couldn't get the lights to work! Sent him away again suggesting he try a switch. He came back just after 5 o'clock as we were closing the doors, brake light switch in hand asking for us to pass his car. He was politely told we were now closed an it would have to wait until Saturday but that wasn't good enough for him.

Two chances at a free restest, still giving him another chance, sorted his headlamp image fitted a bulb and diagnosed a brake light switch all for nothing and its still not good enough. What do people expect for under £30?