Worst Service Ever!

I bought a Grundig oven from Hirsch's recently and since the day I received it, it has been a problem. The first fault that I logged took Defy some 10 days to come back to me. The Defy technician that contacted me told me that he had no knowledge of Grundig ovens so he could not give me specific advice. With regard to the second fault that I logged (the oven switches off after 20 minutes) I have had no response whatsoever even though Hirsch's who I bought the oven from have made numerous follows up on my behalf. This is a brand new oven and one would think that Defy would make some attempt to uphold the warranty. My advice is stay away from any appliances that Defy markets and sells.