Best Services Cadillac in Phoenix AZ

This company has horrible customer service and reliability.  They came out a month and a half ago to give me an estimate.  The technician said I'd hear back within a day or two with the cost proposal, after taking parts from my windows with them to determine manufacturing specs, cost, etc.  A week later, I heard nothing and initiated a call with them.  They said they'd email me the estimate... after three attempts to get my email address correct (they sent it to the wrong address twice), I finally received it.  I agreed to the work, paid half the cost upfront as a downpayment (per their request), and was told once they receive a timeframe on the ordered parts, they'd reach out to give me a status.  Weeks go by and I hear nothing from them.  I emailed and received no response.  So I called to inquire, and was told parts are delayed due to covid, manufacturers are in California, etc.  I understand that is out of their control.  However - after a couple more weeks when they finally called to tell me parts are in, and scheduled a time with me.... they failed to show up.  There was no communications, no calls.  
They had given me a window between 1-5pm, and when it was close to 5pm I reached out to ask about their ETA... was told someone would call me back with status, yet nobody reached out.  I called again and was told the technicians are running late and will still make their appointments for the day.  
Yet they never showed.  I called the company (after 5pm), and of course nobody answers.  
This is such an unprofessional business.  At this point, I'm questioning whether they just took a few hundred dollars from me plus the window parts and have no intention to follow through.