Drain Works Plumbing

We just moved in our new house to find that we had backlow issue. We can't even take a shower before flooding the basement. The lady who sold the house had many flooding herself and her solution was... to repaint the basement. Not to say that the inspection overlooked the issue.
We called a first plumber who worked the shower drain with a bamboo. Didn't worked much but cost $150. Seems that bamboo might be a good opportunity for future stock investment. He called a colleague that did a video-scan only to find a single root. Find one root, snapped it and asked for $350 cash. We asked for an invoice that was never sent: the guy was fired by his boss after forgetting the cash in his pocket. Now the boss refuse to respond our call and we cannot get the invoice. Sounds familiar to you?
We call several other agencies, just to find things that Toronto plumbing industry seems full of Halloween characters. One offered to tube the pipes adding one layer from insie the previous clay pipe. Yes but what about the branches? Another offered to use some herbicide foam after snipping the roots. Well what about the herbicide ban in Ontario?
Eventually some good friends recommended us DrainWorks plumbing. You know what they are still our very good friends. They came the same day. Did a thorough exploration to both ends of the drain. Found 6 majors roots issue (not just one). Open the flow such that we could breathe (breathe would give you an idea). The made a quote that was right to the cent. When we ordered the work they arranged us to have a team the same day. They replaced 70 feets of pipe outside and under our house, worked super clean, minimised damage to our basement and landscape...
Of course I would strongly recommend them. The issue is how to put in jail all the cow-boy working in the field...