Aluminium installation nightmare

I was left in disbelief. Such poor workmanship in Aluminium window and door installation. Poor material used, gaps on corners of the windows and doors, wind going through windows. Unsupervised workers thereby quality checks not done. Owner very distant when you report such poor work. Very disappointing from one business owner to another, its a shame and a loss of hard earned money. Employees are taking advantage of him not being hands on and thereby killing his business or allowing them to kill it. I had trust and hope that they will deliver superb job from previous reviewers.