Kwikot poor service

My geyser burst on Friday, it was still under warranty, installed on the 20/05/2021. The plumber who installed it advised us to contact Kwikot directly. After calling Kwikot numerous times and it eventually got logged and Kwikot came to my home on Sunday – 10/12/2023. They said the installation was done incorrectly and refused further assistance and left. My plumber who I’ve also called numerous times disputes that fact and says Kwikot are making excuses not to replace the burst geyser The geyser still is under warranty.