Architect Glass

After i received the indivitual itemized written bid for the different items that I wanted done, I asked them to perform some of the items, rather that the entire job.  They said that they will have to raise the price on the bod (eventhough I have a written bid), because I am not performing the full job.  Namely, installtind the door will be $650 instead of the $500.  However, if I later decide to do the rest of the work, they will compensate me for the extra $150.  I agreed.  They installed the door for $650.  I paid them.  I now wanted them to do the remaining work, as described in their bid.  I called them numerous times, left messages, no one returned my call.  I finally got them to pick up the phone. They said that they will NOT reimburse me the $150 that they promised.  They were liars, liars, liars, liars, liars.  I will never do business with dishonest people like this again.  It's sad for our society to have to deal with people like that.