Best High Efficiency Filter Systems in Boston MA

I scheduled an appointment for 5/6. They gave me a 4 hr window of when they would arrive. At 2:55pm I received a text telling me they will call me shortly. I replied to the text saying ok, and asked to confirm they are still coming within the 4 hr window given to me? I did not get a reply to my question. They never called me, and they never showed up. I will NEVER use this company! Extremely unprofessional.