Defy - how much do you rely on your products?

The oven we bought in December had manufacturing, part and assembly faults. After a number of approaches by me the oven was replaced. On registering for the guarantee, I discovered that the replacement oven guarantee is only valid for the time remaining on the original oven. This is a new oven! Surely the new guarantee should be for the full period! We are careful appliance users (yes, some are not) and being penalized for Defy's faults is unfair in my opinion. We have re**** on Defy for over 40 years.