TALK TO THE SUPILER, WE DONT GIVE REFOUD

Bought a Ariston geyser from thier Pretoria woodlands mall store, installed it the light comes on for like 1min then it go off, waited for few hours, water never got heat up, tried this many times. so went back to the store, their given me a what app number, ask me to talk to thier supiler(Ariston) myself, when I talk to the supiler on what app they will only reply me after 3 hours, and them ask me to send pictures of the installation, so I did, them the guy accuse me of lying to him of not install the geyser, then ask me to send videos to him and refuse to send technician to check. So I went back to the store for a refund, the store guy called Thabo tells me they dont do refunds, tells me to talk to the supiler again. So I did, same thing happens again, so i talk to the Thabo guy again, he says he will contract head office, a week has been passed, everyday I ask him what the way forwards, he just reply me still wating for the head office to reply. I just want to ask, I bought this geyser from builders warehouse not from thier supiler, why do I need to deal with thier supiler, you builders warehouse either give me a refund or have some one fix this faulty ****. we bought this geyser on 2020/06/02 it has been a month now with out hot water to shower. I WILL NEVER EVER BUY ANYTHING FROM THIS **** COMPANY AGAIN.