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?
I was in Chicago helping my father move. His house was on the market and we were in a rush to sell and close on the house. The day of the open house the water heater started leaking all over the basement. We called and were pleasantly surprised to get one of the owners on the phone. Bob assured us they would be out fast. They got there a hour before the open house, had the basement dried out, and the water heater replaced before the first real estate agent walked through the door. Great job!
Neighborhood Plumber & Rooter is awesome! I had a leaking water heater and submitted a claim to my home warranty service in the morning. A few hours later, Gary called and said he was in the area and could come by, but I was already at work. We made a tentative plan for him to come by in the afternoon if his schedule permitted, which fortunately it did. He was able to fix the problem with no issues. What impressed me most was Gary's professionalism and friendliness. I felt like he went out of his way to accommodate us even under short notice. He is the definition of customer service and I think I've found our go to plumber. If you're looking for friendly and honest service, make sure you give Gary at Neighborhood Plumber & Rooter a call. I even recommended him to our NextDoor community.