Disgusting service from Spar zevenwacht mall

I bought a heater at zevenwacht mall on the 14 June 2021 which is now 3 months back, then the heater stopped working out of the blue, one bar stopped working, then after 2 days whole heater just stopped working, then I took the heater back with the slip and the box that showed when it was bought, I was told that the heater is going to be taken back to the supplier and then when they received feedback they gonna call me, 2 weeks pass no phone call nothing up until I went back to check for feedback and guess what, nobody knew what was done about the heater whether it was sent to the supplier or not, the little paper where they wrote my details is not with other papers, because I saw that they write the details of the clients who returned heaters on the little page and the client gets nothing in return like a slip for instance, then when they checked my little paper with my details was not on that draw, nobody knew where it was and what was done with my heater, disgusting service ever from Spar zevenwacht mall, now I spoke to a lady by the name Samantha when I went there for follow up, she promised to get back to me first thing today, she said I'm going to make it a priority and guess what it's now 12.25pm and there is still no feedback, this is so uncalled for its totally unacceptable, first of all, you guys are selling nonsense heaters, and then give a 1 year guarantee in them, when returned back you don't replace or refund, actually you don't care, secondly a client must be the one to do follow-up in all of that, which leads the client to pay for cost of transport, to waste their time, their energy, like I don't understand why must the solution of the problem from your heaters must involve client's effort, please call me as soon as possible,I'm taking you to social media, you will trend all over, I see on your Facebook page you lie and publish only good reviews which is a lie, you going to see I'm telling you. THEN THEY CALLED ME AND HERE IS WHAT THEY HAVE SAID