bad service

I purchased a Univa stove from House&Home N1 City in December , 7th 2020. 3 Weeks after that we have noticed that the plates are not heating properly and the oven keeps on switching on and off by its self. I then contacted them to inform them that i have an issue, HouseandHome promised to send me out a technician to come look at the stove, We have not had a technician at ly place. I called them again yesterday 22 January 2020, and they kept on transferring me to a number where there was no answer, I called the n1 city branch. They then told me that the person who can assist me is on tea, and they will call me back. I am not able to cook properly. I am so discussed at the service and how this matter is being dealt with. I paid full amount for a stove and with less then a month the stove is not working, and when i do make contact with House&Home , I am not being taken seriously.