Poor quality geyser and service

The contractor (appointed by Standard Bank) installed a Duratherm geyser for us in February 2021. After installation, the geyser did not heat the water. I turned out that it was a faulty thermostat. Duratherm did not want to replace the geyser and sent a plumber to replace the thermostat. He did not have any electrical qualification but claimed he knows what he is doing. Luckily my husband checked the connections afterwards and some was loose :(. Today (less than 6 weeks later) the thermostat is once again not working and it is very difficult to get to peak to anyone at Duratherm. You get put on hold without any response. |Eventually I got through to a person ( Zubaidah) who asked that I send an email and they will send someone out. After another 3 hours I have not received any response or even a confirmation that they received the email. Very disappointed on the lack of service and customer care.