Disappointed with geyser after sales support "warranty"

Warranty promise not adhered to - have Gap geyser burst which is under warrant. 5 years is the promise from the company, my geyser burst and had a call out, they sent a technician who failed to give me proof of the worker maintaince completed.

My geyser burst again and in attempt to claim warranty maintaince the office can't locate a job card nor find a record of my previous claim to validate if I'm still covered And the person I was talking to decided to hang up on me and refuse to assist...

Such a horrible experience, after sales support is not a priority for this company I am really frustrated as they taking me from 1 pillar to the other and none of the references are able to assist.... disappointing service.