FLORIDA AIR SVC

I had extensive renovations done on a large portion of my house. I used a GC which is how this guy got in the house. The first part of the job, duct work, was explained by the GC in detail to Billy making it clear where the ducts needed to run. He had one of his employees do the work and the ducts were run exactly where they were NOT supposed to be. He had to modify the ducts a second time which I feel is now creating AC problems. The room where the ducts were modified does not cool and condensation is damaging the drywall ceiling around one of the vents. I called him to discuss - basically was told that he would come out to look but if it?s not his problem I have to pay for it. The range hood - it?s a center island gas cook top required by code to be at a certain height. After a few weeks when I started to use the kitchen anyone using the stove are knocking their head on the hood. Its way too low. I was told that it is actually 4" lower than the code requirement and what the enclosed instructions state. I called Billy and told him what was going on. He asked why was I putting my head under the hood and ended with wanting $500.00 to raise it. In addition, the hood fell out of the ceiling a few months later. He did come out to fix it and was apologetic but my GC ended up doing it same day vs waiting until Billy could get back with a crew.