Professional Auto Engine

I recently had a used engine installed in my car from Pro Auto Engines.  I drove down the street and had to return because car was not running right.  The mechanic drove it and said that some wires were crossed.  I drove the car home.  The next day, car would not start.  I had it towed back to shop.  They said it was a fuse, so they replaced the fuse for $65.  I picked up the car the next day and drove it home. I turned the ignition off and tried to start it again.  Car would not start.  I had it towed to shop again, which I had to pay for this time ($85).  Pro Auto Engines Manager, Andy said they could not pay for the tow again.  Andy said it was the alternator this time.  He put on a used alternator that he had at the shop.  I went to pick up the car and tried to start it.  It would not start at the shop.  Mechanic came out to jump start.  It did start and Andy assured me that it just needed to charge.  It will be fine.  I got home and turned the ignition off and tried to start it again but car would not start...nothing.  I called Andy in the morning and left a message but no return call.  I called again in the afternoon and got a voicemail and left a message.  No return call. So, after $4500, my car is sitting in front of my house and will not start.  The last time we picked the car up from Pro Auto, Andy said that it wasn't anything they did.  There must be something else wrong with the car.