I did all you described already, as i wrote i did the economy reset several times, teleporting, ferry transport, sleeping, all this has no impact..
Yes, i do ETS2 Telemetry service with the FPH Speed V therefore i have joined a company 3 days ago. The jobs themselves do not matter to much of course, but my truckdrivers are not working anymore correctly as they go on 300 day trips also. Fire them and emlpoy them again has also no impact as they go on 300 day trips again immediately.
Edit:
I tried to reset economy (again as written above) with turning of the telemetry software but again as soon as i go into the truck in MP Game the time snaps back to the 300+ hours buffer.