Bulldog Home Comfort review: Poor ability to make the system they just installed to function.

We called, they came the same day. The next day, Friday they installed the system. It did not heat or cool. Called them. They came out Saturday and “fixed the thermostat problem” said it would work. It did not. They had made an appointment for Monday, so we waited. They came out Monday, changed out the thermostat, helped us set up
wi-fi. Tureday morning we turned on the system, to heat our 66 degree temp. 1 1/2 hours later, no change in Temp. System not working. Placed 2 calls to them today and NO RESPONSE. Out high efficient American Standard system is not working. Maybe someone could reach out and fix what ever is wrong with our system. PLEASE!