Shocking service from Defy

We bought a Defy Gas/Electric stove in August 2015. Since we got the stove, the Left Back plate igniter has not been working. Waited more than a month for a technician to arrive. When a technician finally arrived, he had to order a part. We waited more than two weeks for the technician to come back and replace the part. A couple of weeks after the plate was fixed, it stopped working again. Waited a long time again for the technician to arrive. When he finally arrived, new parts had to be ordered. After waiting a long time again, another technician came to repair the stove, but a day after he left, none of the plates would work. The technician came to disconnect everything and have not heard from him again. Several phone calls and promises were made and to date nothing