Bad/No Product Support by Artificial Intelligence

I had a solar system installed in my home at the end of 2019 by G.W. Technical, trading as Artificial Intelligence. I soon became obvious that Hendrik Nagel and his team are not qualified and/or knowledgeable with the subsystems characteristics to ensure a symbiotic, integrated system, and it took them about 18 months to get it functioning to expectations. Although the system performed well for close to two years, I am now experiencing black outs at night, where the system does not fall back on the grid, which was available, and had to be reset manually during the night. I tried to call Hendrik Nagel many times but, although I can see on WhatsApp that he is busy on his phone, he ignore my calls and messages.