DEFY GAS STOVE

On August 14, 2023 I telephone Defy customer services to report my gas stove oven DGS902/DGS904 as not working. The stove is under warranty as it is not 3 years old. The technician arrived and told me that the oven themostat was not working and he had to order the part. I previously had the same problem over a year ago and the oven themostat was fixed quickly. It is now September 8, 2023 and still no part available. How can this be 4 weeks later I am left with a gas stove with an oven that does not work and no ETA on the part. Is the oven ever going to work again? I would advise to think twice before purchase a stove when parts are not available. I have being phoning and phoning but I am getting nowhere fast and the technician just avoid answering my call (don't blame him) Please can some please advise on how long must I wait for my oven to be fixed or are Defy waiting for the warranty to expire? I am so feed up with Defy at this stage it is unbelievable. Please can someone just fix my oven or give me a answer i.e., we don't have part and your basically on your own on this one fix it yourself, the warranty means nothing.