Unprofessional and doesn't finish a job

If I could rate 0, I would. This company started installing a security camera system in November last year. They took so long to get the system workings, that lightning hit the camera, we couldn't claim from our insurance, because it wasn't a fully functional system. Before lightning hit, they had to send the processor to the 'engineers' to figure out what was wrong. Took a few months, nothing was in fact wrong. Then when they had to reinstall the system after the lightning hit, we paid for a new ptz camera, which was faulty. So they repaired the old one, found out that one of the clamps was put on too tight! So now we struggle with getting our money back. Also we still can't see the camera's on the app and they just don't respond. André who installed the system has now blocked me. Lionell Mark's doesn't call back and doesn't respond to messages, he doesn't even read them. When his technicians were wrong about the size of the ups for the camera's he actually said he'll stand up for them because they're not professionals in that area! They advertise a service and then say they're not professionals?!