My gas line was leaking and I choose Hayter to do the repair. They quoted a flat rate of ~$60 plus ~$80 an hour (for as long as took) to do the repair. However the kid who arrived took two hours to tell me that he couldn't complete the job, and I had to wait (without gas) for the quote. According to Hayter I had to replace the entire gas line!
The quote was $3,500 and I choose to shop around, when I finally decided to go with Hayter they advised they wouldn't honor quote because they forgot to include "another guy" in the quote.
I decided to back out and had to pay for the initial visit ($258). I went with Absolute heating and comfort, who arrived within ~20 minutes of my first call, and fixed the issue on the same day. They traced the issue to a single union (coupling) and fixed it for $343 (or about $80 more than I paid Hayter to quote the issue).
TL;DR Hayter charged me $258 to tell me that I needed an entire gas line, when in fact I just needed one coupling replaced (at about %10 of the cost).
By the way; the kid from Hayter didn't close the access to my crawl space and left it open when he left.