Waiting over a month for repair of faulty geyser

I purchased a 16 l gas geyser (Zero Appliance) from their winalot site at the end of June. Once the geyser had been installed by a certified gas installer and according to the supplier manual, it was found not to be working properly. The geyser would only heat water for 5 minutes instead of 20 minutes. So from the 11 of July I have been without a shower! I have written continuously to the agents who have put me through to the Durban depot and back again to the Johannesburg head office. The repair agent in the Johannesburg head office has tried to get another company in Durban to test the geyser as their Durban depot may not be equipped to test and repair the geyser. The other company failed to respond to the request and from then there have been emails (last response that I received was on the 5 August) assuring me that the Durban depot will pick up the geyser for testing and possible repair. The email also stated that Zero Appliances was trying to find a resolution to my problem.This has not happened and emailed the repair agent the same on the 6th August and have not heard back since.<br> <br> I find the customer service of this Company appalling! All email correspondence has been kept.