Not taking back faulty kettle

I bought a Kambrook kettle from our local Clicks in July 2014. We only started using it late 2014. We discovered that the kettle leaked. My sister took it back,where they tested it and said its NOT leaking. She then used it and when it leaked took it back as is,with water. She was then informed that they dont have stock at the moment but will phone her when they do. In this week I went there to ask about the ketlle and it was \TESTED"again and found in working order. I mean"