Warranty Claim

I am extremely disappointed in the service I have received recently. I purchased a geyser in 2015 September which has a 5 year warranty it has since been leaking and had a plumber remove it when I discovered it is still under warranty. I immediately contacted Cashbuild for the claim process. I have been advised that I do not qualify to claim as I have removed the geyser from its installation. I am dissatisfied with this response because the geyser was delivered and I self installed, why is it that when they are required to pay out all of a sudden all these clauses are brought up. There was no warranty card stating the same. I feel this is unfair to act to your customers I have also been in contact with Franke your suppliers who have advised that I am not eligible to claim, I feel you are all dodging the claim as you had no part in installing this geyser