VERY VERY BAD SERVICE FROM BENCE SOLAR AND ELECTRICAL.

As per 4th request for COC as per invoice, at least I received my Test Report. Pieter (family member and Director Jurgens) did my solar panels installation in March. Both blocked my number and ignore my calls. 5 months later STILL NO COC received!!!! If I compare with all the reviews on their page, every one applause them BUT HOW CAN I DO THE SAME? I need the COC for insurance purposes. How much longer do I have to wait for COC???