Ok, let's have fun with another scenario.
Around 20 years ago I rearranged two rooms in the house. I had Axminster carpet laid throughout the house only a few years before so when I moved the kitchen and put parquetry in one room I discarded the kitchen vynil and replaced it with the carpet from the other room.
Picked a maintenance firm from the yellow pages and asked whether they would send somebody out to relay the carpet. My wife hardly spoke any English, so I had to handle all these things over the phone in my lunch time. The guy on the other side of the phone says "you would be better off getting somebody from the ads in the local paper (going rate at the time would have ben less than $100 for the whole job), we charge the princely sum of $50 per hour". We agreed that a couple of hours would be about right for the job, taking into account a bit of cutting and pasting to fit the carpet to the smaller room, so I told them to go ahead.
The guy came on a saturday, so I was home to see what happened.
He had with him an "apprentice" i.e. a young kid who just helped him detach and carry the carpet to the other room and then sweeped the bare cement. He did not touch anything afterward and just stood in a corner watching. Fine with me because I could see that the job was done properly by the tradesman.
The guy then proceeded extremely slowly with the job, taking a smoko every half hour, making numerous phone calls and taking over an hour for lunch. It was obvious he was wasting time hoping to be called for some other job that was not coming. I realise that he is trying to milk the job as much as possible but I do not complain because I assume he will charge working (albeit not effectively) time, not expended time. At this point he must have assumed that I was the sweetest SUCKER he had ever met.
The bill comes in: $50 an hour for TWO people for SIX hours plus materials = $600 plus materials.
What would you have done?