I have no doubt you will have a few id10t's calling rattling off (fake) credentials or actually meaning they managed people who did those things.
But honestly, is it so much to ask that the card flipper automatically ping the customer's router and others on their street before haranguing them to reboot their modem, router, PC, car, cell phone, and cat before even considering the possibility that they might know what they're doing?
Quite honestly, with some very basic training and proper tools, there's no reason any of my connection down calls should take more than 30 seconds to result in a truck roll even if they don't believe a word I say. For that matter, with proper monitoring, the truck should be rolling by the time I call.
To top it off, in addition to better customer satisfaction, they would save money by keeping the calls short and especially by avoiding rolling a contractor truck that has no ability to fix the actual problem on the line.