Pathetic service from Durathem Geysers.

I logged a insurance claim for my leaking geyser a week ago. Insurance was very fast to respond. They advised me that geyser is under warranty. Warranty claim submitted to Duratherm. Absolutely no response received for days. Eventually they advised the flange gasket must be replaced. Replaced that yet geyser is still leaking. Called the call centre and no answer. Now the number does not exist... talk about great service.