Unfriendly Electrical Service Provider

Initially I thought this company is trustworthy and reliable. The owner, Marlon Whitten himself did the installation of a solar batteries and inverter for my house. He unfortunately installed expensive lithium ion batteries in an enclosure, which are not approved. When I confronted him with regards to the enclosure for the batteries he got very defensive and hung up the phone. Since then he would not take my calls. I really thought this is a reliable and trustworthy person, which is why I initially gave his details to friends and family for electrical work. He comes off as professional, he is knowledgeable but unfortunately he is taking short-cuts for the quick money and doesn't seem to use his knowledge for his clients' benefits. When he gets confronted he becomes defensive and starts swearing at clients, which I have witnessed while he was at my premises when he was talking on the phone to clients. After these experiences I would not recommend him.