Empty Promises

I bought a product (PS3 Gaming Wheel) from Takealot as I always got great service, the item I bought had a factory fault and the cooling fan on the item stopped working, now the item itself has a one year warranty from the manufacturer of the item and I was within this one year period to claim. Takealot insisted I send the item back to them for them to return it to the manufacturer of the item, this is when Takealot decided that they would not return the item to the manufacturer and rather give me credit on the item, I had just bought a racing system that this gaming wheel fits on and the cost alone of this was R2500.00. Now they promised me in writing that they are going to supply me with the exact same item I was sold which was on the 28th January 2015 and since then have only given me excuse after excuse why I haven't got it yet, on the 1st of April 2015 I am offered a replacement model of which will not fit the racing system I bought and would cost less than a fourth of the amount I paid to begin with and the replacement value of my item is about R7000.00 and the new offer from them is only R900.00, This is not at all fair and I'm going to take it further.