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I have run into something similar. Unfortunately I put out about three times as much to have them tunnel under my slab and replace the line which had separated (in two places) due to ground motion, and replace about 50 feet of sewer line. The plumber came out with a camera and showed me the two places where the line had parted and shifted, and of course roots galore. I reluctantly allowed the work to go ahead, and from the 20/20 hindsight view I wish I had not.

BTW the nearest manhole was more than 150 feet away until the recent rebuild of our sewers and water lines this past summer, now there is a manhole right in front of the house.

After my line was replaced we continued to experience the same issues with improper flow, and of course the plumber sent someone out to check things, and then ran a camera down and found another defect a little beyond the end of the repairs under the house, and of course they want a lot of money to fix that. Then on another visit, a different tech came into the house and removed a part from the toilet and declared the problem fixed, and actually all he did was stop the toilet from being a water saving model.

And then after several other visits, and my neighbors experiencing a similar problem (wish we had known before) the city dug up the sewer main in front of our houses, and discovered that the city's line was almost totally clogged with roots.

I am better educated about it now, and plan to invest in my own 100 foot electric snake/cutter before too long.