It sounds like they are trying to go through the house trap by going through the vent both to snake it and with the camera... As you can see its not working! Is there other access? In my experience there are usually 2 cleanouts directly over the trap. These are where a snake may be pushed through the trap to clear the line. Trying to get anything to go through a trap from several feet and bends back is very difficult. See the diagram & pictures below so you might better understand what you have...
I would strongly recommend getting a second opinion from a plumber that does drain cleaning,,, Maybe one without rooter in their name....
Jetting is what they were talking about and it is possible that it may help. But I would find other access and snake it through there if at all possible. Most of the time the clog is right in the trap!





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