Well, it's certainly unfortunate that there were all the issues that have been described around this stove. I'm glad you got your money back.
I'm sure the dealer and manufacturer would vastly prefer equipment that worked the way they expected as well. When it doesn't, it's a costly PIA for everyone.
But that's the way it can be with pretty much any mechanical device, especially new designs. Sometimes products just don't work the way expected. While unfortunate, that's a risk you take with any such purchase, even if it should be a small risk.
So go ahead: be angry. You're entitled. It sounds to me like the dealer and manufacturer were acting reasonably in a difficult situation to solve the problem. But when the POS wont work and no one can figure out why, everyone involved, customer, dealer and manufacturer are bound to be unhappy.