Delta Mechanical Terrible company! Denver CO

That is the only company that we were provided by Home Depot as their only official representative to install a water heater.
Delta Mechanics present themselves as that they can beat any of their competitors price by 10%. Lie! we had an estimate from another company for the same service for $170 plus parts. Delta Mechanics said that we can only buy parts from them and it would cost us $300 (we could get them in the store for around $50, we checked) The heater itself cost $540, how can a couple of houses to connect it cost $300?
since we did not have time and wanted to work with home depot directly we scheduled an appointment with these guys.
They did not show up at the scheduled time of an appointment. So we called them, they said that their mechanic can be at our place not earlier than in 3 hours and not even guaranteed. We ended up canceling our request and got it done for $275 with parts and delivery.
I think that is the worst company I used in a while!
Shame on Home Depot as well for only providing this company.