Most plumbers wont mess with the septic tank. We deal mostly with components inside the house. Did you have a vent pipe in the yard (often looks like a candy cane made of PVC) before the repair but not after? If all he did was replace the line it shouldn't cause a smell inside the house. All plumbing fixtures inside the house should have properly functioning traps. Those traps would create and maintain a water seal against the sewer gases. You should have at least one vent through the roof to equalize pressures within the drainage system. This prevents positive pressures within the system (caused by fixtures discharging into the lines, ie toilet flush) from pushing gas out through the traps, and negative pressures (the waste in line will pull air behind it like your finger over the end of a straw) from sucking water out of the traps.
This is a rip-off company! I called them because my sewer pipe from my house was clogged and running slowly. When I called I asked what their rates were and was told that I would be given a price on-site at no cost. Okay, so when the guy arrives without even looking at the problem he said it would cost between $2 and 3 thousand. I told him to get back into his truck and leave. Then he said he could do it for $1800. Again I told him to leave, he then said he could do it for $1000 because he wanted to have a good business relationship with us. I went to Home Depot and rented an industrial powered drain cleaner (snake) for $50 and fix the problem within an hour.
Headquartered in Collin County Texas, Crown Plumbing Service is a family owned and operated corporation that remains committed to old fashioned values of professionalism, dependability and affordability. We realize that regardless of the magnitude of your repair, when you need plumbing service, urgency, accuracy, and integrity are critical to the success of your repair.