This business does not give any indication of prices over the phone and say they do not "charge by the hour, but by the job". It turns out they have a price list that is fixed for types of jobs, but they won't even give you those prices over the phone. They charge $100 for the call out, although they say it's not a call out fee, but just to protect themselves from no shows. BUT, if you don't accept their quote to do the job, they charge you the $100 anyway. Sounds like a call out fee to me. And since you can't get any indication of what the job will cost before they come out, you're kind of stuck with it even if the quote is ridiculous. Their rates are way over what you would expect for the job. We paid $348 to unblock a drain, a job that took between 60 and 90 minutes. I won't be calling them again.
If nothing inside the home was altered you should not be getting a smell. Personally I'm confused as to why the repair person would have left the original line there and ran another one through a new hole. I would have pulled the old line up, ran the new line (in PVC) and used the same hole in the septic tank instead of creating a new one. Did he seal up the hole in the tank from the old line?
The word "plumber" dates from the Roman Empire. The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes and some were also covered with lead, lead was also used for piping and for making baths. In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall". Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber.