No company name is given.
When they have started the work, they find some issue for which the have to raise the $100 price.
Now, to be honest, our ducts had not been cleaned for a long time.
Anyway, the divine (yeah! ;)) guy had to borrow my metal cutter, which of course ended up in his tool box in his truck when he came for the money. And yeah, they don't want to pay taxes and leave a mess.
I doubt the return ducts have been cleaned around the corners!