Bad service

Worst experience ever, if you are an installer let me WARN YOU, these guys will discredit you, my issue is with a battery, it worked for the 1st 4 months after the whole system installation, my installer checked it and realized that it does not charge, took it back, we were advised that they took it to the supplier who "claimed to have replaced something" the installer installed it back, withing a few days the batter did not work, it would shut down while I am working, mostly realized that it shut down when I am warming food from the microwave oven, my installer took it to his house to charge it, still no luck, he spoke to these guys who gave him settings to use and sent them the screenshot, still the battery was not responding, we advised these guys of the issue and that they need to give me a new battery, that's when they started claiming that the issue is me, That I am overloading the battery" mind you I stay with my son only, I use gas geyser and gas stove" when they realised that I am not the issue, that's when they claimed my installer is ***********, that he did not install the system correctly and when I asked them why did the system work for the first 4 to 5 months , they did not have an answer, they still maintained that my installer is the one who does not know how to set it up, and that he did not set it up as per industry standards and that's according to their so called "technician" they then told me that I can pay almost a R1000 to get their technician to fix the settings. When I asked them how many clients did, they get who had issues with my installer, they had NONE- (ZERO) they just refuse to acknowledge that they sold me a battery that has a defect. As I type this, I returned the battery on Sat the 21st of August. I have a huge headache as I have been on Eskom and have to buy electricity... I regret asking my installer to install a solar system and I wish he has used another shop to get the system, am sure I was not going to get such a headache.