Window And Door Installation

We had new windows installed by a contractor who did not do a good job at all. A few of them leak and a few of them are crooked and he is not fixing them. Some are even installed inside pre existing rotted frames . We hired this person because he approached us and he was a friend. We really need someone to come here and fix this mess. We will need some new framework done and re- installation of 3 of them for sure(one being a patio door). Altogether there are 6 we are concerned about. Also, we need a new front door that was supposed to be done but we had to fire this guy before he even tried. He did do a back door which also needs help. We will need that door replaced. We will buy all materials , we just need someone to advise us and install them. We would deeply appreciate any help in this matter.