Performance Trailer Inc

This is by far the worst business experience I have had with any transaction.
1) I feel the projects was months behind schedule :
In Jan of 2015, Performance Trailers was asked if they were going to be ready to "finish the trailer" and "install" equipment. The response was "Certainly". That answer can not be interpreted any other way than Performance Trailer being ready when the equipment shows up.
Once the equipment did show up at Performance Trailers, Kevin Gerhardt called me and said they were months aways from being finished, and that they needed another progress payment.
2) They added cost that I feel is bogus, and charged me for work I did.
Per the quote Performance Trailers was supposed to Install equipment into the trailer. My team, and the technician from the company that sold us the equipment spent many hours installing the equipment.
The guys in the shop were involved, which I assumed was part of the deal.
4) Even stuff that is under warranty is costing me MORE money to fix.