Cosmos Electrical Co

I was in a hurry to get this done and John did get it done.
1st invoice was for $248.60, the electrical part. Shawn was great, I did get him to install a light while he waited for the 2 guys to get the vent holes cut and vented. Shawn got it done and left.
The 2 guys were still struggling with the roof vent. One thing I noticed is the guys doing the vent didn't lay down any cover tarps. My counters, gas stove, floor were covered in sawdust. Took me 2 hrs to clean properly. They said they forgot their tarps at another job.
2 days later my neighbor points out that the roof vent is backwards(vents were on the upslope). Called Cosmo's, someone came and reveresed it, didn't even knock on the door.
The Subcontractor wanted $824.90 for their vent. 3 holes, 4-5ft of duct, and a vent, $824.90, I told Cosmo's to, well, I wasn't impressed by a long shot.
I paid travel time for Shawn, which I understand, charged 3 hrs, for Shawn, connected 1 light and the range hood, but I mostly paid for him to wait for the other 2 to get their holes/vents done.
The second bill was reduced by the amount of the first bill, hence total was $824.90+$248.60= $1073.50-$248.60=$824.90
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Cosmo's is great to deal with, Danielle, John, Shawn were all very pleasant, but the bill for cutting the vent was a bit of a blindside. Remedied to my satisfaction?? $576.30 for 2 guys, 3 holes, 4-5ft of duct, and a vent?? I guess so.