Best & worst Gas Geyser installers

I paid over R 20,000.00 for a new Gas Geyser. It never worked properly. The owner Neil Sleight kept promising to come & finally came with someone else & said a bug had entered the system which they eliminated. It worked for a while then stopped completely. He promised to come but did not. I was given the name of Xavier at IGASI Gas service. For no charge he helped me on the phone very simply to remove an air bubble. Thank you Xavier, No thanks Neil.