Guarantee not honored/ False pretense guarantee

On the 27th October 2011 I bought a 81cm TV at HOUSE & HOME Alberton. The sales person told me that the TV comes with a free 12 month guarantee and an optional 36 months guarantee. The sales person explained that the extended guaranteed will only be effective after the Normal 12 month guarantee is finished.He explained that the guarantee will cover my TV set for any kind of repairs should the TV be broken it will be fixed.According to the sales person my guarantee will be for 4 years which consists of 12 months normal guarantee plus an extended guarantee of 36 months.On 06 March 2013 my TV was broken and I took it to HOUSE & HOME Alberton branch as I knew it was still under guarantee.When I arrived at the store they exchanged the broken TV with a similar but brand new TV.On July 15 2015 the new TV gave me the same problem as the old TV I then took it to HOUSE & HOME Alberton where I was informed by the branch manager that there was no guarantee at all on my TV. I was surprised because the first time came with the TV they replaced it without any fuss as according to me it was still under guarantee.The sales person told me that the new TV is still covered for 4 years guarantee