Absolutely useless with no customer service

Recently installed a geyser with the company, install was done very badly when installing(roof tiles broken, ceiling damaged due to water leaking from the broken roof tiles and broken water proofing, together with lights not working) which I only realized when it rained which caused damages. Emailed them, and eventually had a team come out armed with a ladder and silicon sealer, they "sealed" the broken roof tiles together and didn't address any other issues. I emailed them and asked it this was the proposed long term solution with no response. I'm forced to take them up legally for the massive damages I have suffered due to their negligence.