Guarantee is not being honoured

We bought a Samsung dishwasher from Tafelberg furnishers in Cape Town. It broke while under guarantee and was replaced by Samsung, which we were very grateful for. Unfortunately the new machine has also broken now and should be under a 2 year guarantee, but Tafelberg has told us that Samsung will neither repair nor replace the machine. This is very disappointing as we have not even had the machine for more than a year and we were told that it came with a 2 year guarantee. It will cost us a minimum of R570 just to get a Liptronics technician out. Not cool Samsung and Tafelberg - we thought we were buying quality and good sevice. All our other appliances are Samsung, but this has been a very disappointing and frustrating experience :-(