Wow, that is just all kinds of wrong. It puts the repair and safety into question. I hope you get it sorted.
I helped a buddy get his bike back road worthy a few years back after he had a fuel issue the repair shop couldn’t figure it out. They charged him to replace the very expensive fuel pump ($600ish USD part plus labor) and was telling him they needed to replace the injectors when it still didn’t work (another $200 in parts plus labor). He got frustrated and just brought the bike home, still in pieces. After a couple hours looking at it with him, we determined it was just the fuel regulator all along ($15 part)...
criminal if that was it, but there’s more.
I looked over the rest of the bike, working with him to bleed all the hydraulic lines for clutch and brake. Also check the brakes. We found the rear brake pads were worn to metal and had gotten so hot the caliper melted. The bike was just under 20k miles and he took it in regularly for preventative and seasonal maintenance. They happily charged him their high fees each time and gave a nice checklist of the “maintenance” performed. The hydraulic fluid looked like it had never been replaced (was almost black) despite it being required every 2 years. Just reinforced my concern over having someone else do the maintenance on my bike.
Hard to find a real mechanic anymore. Seems like most techs and service folks are only trained to be parts replacement.