DEFY WONT FIX MY STOVE OR RESPOND TO EMAILS SENT

Bought a new stove last year 2021, DEFY SLIMLINER . All 3 plates are not working ,Sent an email in September requesting for a technician to come and have my stove fixed,until today no response or even acknowledgement of my complaint from them. How can a big company like that not have any care for their customers like this. I'm highly disappointed in DEFY SOUTH AFRICA