This sort of work is why roofers have a bad name, iv been roofing 19 years and in my experience it is harder to do a job wrong than what it is to do right. These crooks need to go to prison, the roof on any property is the main security for keeping the rest of the house dry and safe.
They haven't even tried to make a bad job , they know they shouldn't be doing that to someone's roof but they dont care and know its not right. Looks like travellers have found a victim.
There is more shit work out there now than I've ever seen in my life, I blame the customer as much as the cowboys, as most of them don't wanna pay for a proper job, all of our work is putting work right.