Brand new stove not working

We purchased a stove Defy Slimline on the 15/09/2020 on Tuesday ,at Westgate house & Home and the stove was delivered on the 19/09/2020 Saturday but after the stove was installed we discovered that the plates were not working but the oven could turn on.. We have since logged a call with them, which we are told 48 hours for a technician to come and assess the problem.. My biggest problem is how does a brand new stove not work and why can they not take it back and give me a new one it's been four days. We have been eating bread and still waiting for a technician to come through... It seems once you have paid for the item they can no longer value me as a customer this is supposed to be priotized.. Am truly not satisfied with the service