Small Job Bob

I called Bob on a Thursday to remount a pullup bar that had worked itself out of my wall. He called back quickly, explained his rate ($ 225 minimum, then $ 80/​hour afterwards), and we agreed he’d send his guy over the next afternoon.
The guy arrived, a bit late, but that was fine. He worked diligently, if not smartly, to remount the pullup bar. I had trouble convincing Bob’s guy that the pullup bar would have to hold my bodyweight — about 190 lbs. He felt this was comparable to a microwave oven that he typically hung with a device that worked with the drywall. He finally agreed to try some anchors that went into the concrete in my wall. He spent the last hour installing those anchors, but they did not work. The mounts pulled out of the wall easily. The job is not done.
I negotiated with Bob regarding how we would make this right, and he offered a very invasive solution that would include removing the drywall from both sides of the wall, installing wood, large bolts, etc. The cost would be somewhere near $ 500. I decided this was excessive and I would like for him to come repair the wall damage. Its been over 3 weeks and (surprise!) Bob has not dispatched a representative to fix the wall.
I understand that «Bob» isn’t making any money off this job, but I think he has a responsibility to fix what he has done. Perhaps this post will be motivational?