The home I am building is getting near completion. (I bet a lot of the regular DIYers are happy to hear the news.

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I've got some sheetrock issues. I have two nicho areas in the hallways that are inserted in at 45 degree angles. I first complained about the nicho walls where they hit the hall wall just after they had been sheetrocked, taped, and textured. I told the buisiness' rep. that the lines were not straight from the top to the bottom. That the line where they met the wall looked wavy, uneven. I was told that is just the hand texture. It was fine. So, after the nicho area had been painted it isn't just fine. The sheetrock actually has a bow in it in the middle. The line where the nicho wall meets the hall wall looks to curve in about a half an inch in about a two and a half foot span. Yes, the rep. came out again and can see it. It had to have been the framers fault for not putting support there. He claims the whole thing will have to come down, the framer will have to come back, and then, he will do his part... The drywall guy makes it seem like it will be a huge thing to get this area right. So, I was reading in another post about a fiberglass filler??? Do you think this is do-able in my house? Someone (not the drywall guy) suggested putting more mud and adding some kind of paint kilz(?) to stop the cracking. Only one nicho line is horrible in my opinion. I see little imperfections in several places all over the house, but am only complaining about the one that I think looks bad enough for people to think the house wasn't built well. P.S. I also have some corners of walls that don't go straight up the whole 12' height. It looks like the walls sort-of bend in at the top. Can this be an easy fix or should I just leave it alone?
I feel like such a whiner!