No show for solar installation

I commissioned LLHS Electrical and Plumbing on 30 November with a deposit of over R100k to install an 8kVA hybrid system with invertor, panels and batteries. To date they have installed 3 solar panels, an empty switch panel box and some trunking. Numerous arrangements and deadlines have been promised over the course of this period and every single one has been reneged on. Every single time. There is always a host of excuses and trumped-up reasons for their no show. There is no feedback or engagement from them and they do not answer messages or calls. My installation has still not been completed at the end of May.