Frustrated customer due to lack of service

I bough a built in set stove and oven on the 12 Dec 2020. On the 29th Dec I decided to use the oven for the first time and the inner oven door glass shattered. The matter was brought to Defy attention on the same day and on the 30th Dec I received a job number and was told they are waiting for a replacement order. To date no communication from Defy. Next week 29th Jan it will be a full month sitting with the problem which makes it impossible for me to use the oven.