CNA Makhado passing the buck

We purchased a Nikon Coolpix S3200 two years ago, and after about 6 months the lens unit malfunctioned. We returned it to CNA Makhado who sent it off for repairs.<br> <br> About six months after this repair, the lens unit malfunctioned again. We again took it to CNA Makhado who sent it off for repairs in January 2015. It was fixed, BUT, when we went on holiday to the UK, the lens unit broke AGAIN. On return, we took it back to CNA Makhado and said we would like a new camera as this had happened three times now. We were informed that we would need to speak to the repairers as the camera was now out of its guarantee period. Whilst I accepted that the camera was out of its period of guarantee, the replaced part was new and therefore should still be under guarantee.<br> <br> CNA Makhado are refusing to assist and say that we should be contacting Nikon. I was under the impression that when you purchased something from a shop, then they were obligated to assist... otherwise what is the point - we would all be bypassing shops and going straight to manufacturers.