Product and services issue - Consumer Complaint for OK Furniture - Head Office

I bought a defy MOH9328B 30L MINI OVEN on the 07-02-2020. Today the small plate of the stove stopped working. I tried to call Butterworth OK Furniture at the following number; 0474018500 and some lady answered the the phone and told me that I should lay a complaint online and then dropped the call. When I tried to call the same number again it didn't go through but instead said that "the number you call does not exist".