A FAULTY FRIDGE

On 25 October 2013 we bought a Defy fridge worth R5999.00 as a Gift to our Aunt at Game store when the were still at Springfield shopping Centre, William Moffet. In 2015 she experienced problems and reported them, technician was sent and replaced a sensor but there was no change instead the fridge froze both sides. We have on numerous occasions communicated with came and not getting any positive feedback and ultimately we requested them to change the fridge seeing that they've been defeated in fixing the fridge but they are refusing to replace claiming that the 2 year guarantee is over and that is not true because it is now 8 October 2015 and they have delayed so many times with responding to this problem so that we can run out of the guarantee period. The reference number for the call on 6 October 2015 with Defy is 432221, the barcode of the fridge is ***. I do have all the slips for this purchase. Please help