Our washer overflowed and we called Mr. Rooter in for help. After inspecting our clean out and going up on the roof and inspecting shafts from kitchen and bathroom, we were told we had a pipe collapsed in 3 places under the slab of our house. Estimated job would be well over 20,000. Paid in 173.00 that day. He indicated he would be back for final estimate. We have never seen him again. We called local plumber, Staas Plumbing to come in. After thorough investigation, he determined there was no collapsed pipe! Blockage repair cost less than 150.00. Don't ever use Mr. Rooter!!!
They were called in by American Home Shield, and they wouldn't come for 2 day.  When they finally came out they refused to do the work because it was "too clogged, and there was water in the sink". They gave a 250 dollar quote saying AHS wouldn't cover this type of repair.  We had AHS send a different plumber and the new plumber was able to get the sink unclogged (we also put baking soda/vinegar down the sink which seemed to help things)
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?
*$200 minimum purchase required. Valid at participating ARS® Network locations. Not valid for third party, new construction or commercial customers, with any other offers, discounts or prior sales. See service center for details. Coupon required at time of service. Void if copied or transferred and where prohibited. Any other use may constitute fraud. Cash value $.001. Offer expires 11/30/2018.

Plumbere Repair Co