Pool walls out of square

[Manslick]

Another thing I was just thinking after reading some other posts, should there be a floor drain in the 7' deep end, that should of been put in when the floor was poured

It's not a drain per se but a feed line to the pump. I don't suppose one is absolutely necessary, though I've never seen a pool without one. Can’t see it in the pictures.

Did they lay the plumbing?

Let them worry about damage to correct the geometry. All you want is what you paid for – a square pool. Any damage they do in the fix is their problem.