Heat Tech geysers - no service

On Monday the geyser burst. The first plumber could not assist because the geyser is still under warranty. We were promised that it would be sorted out asap - as soon as they locate stock of a geyser. We were also told we could replace the geyser ourselves but then have to foot the bill for doing so. When I contacted Heat Tech to speak to the CEO, Wayne Virtue, I was told he is in a meeting and to no one's surprise nobody has called back as yet. Today is Friday at 16h21 and the plumber has only just arrived to hopefully replace it.