no stock but sells items

I have purchased three items from Game Gateway a Samsung 360lt fridge a Samsung 6kg washing machine and a LG 30l microwave on the 26/02/2016. I spoke to the salesman and the fridge and microwave will be delivered to me tomorrow after two weeks delay but they have informed me that they don't have the washing machine in stock nor will they be getting any more. I have paid for these items and I demand you send me the 6kg Samsung washing machine in silver or white 7kg Samsung as this blunder is no fault of mine. I had only budgeted on the price that I paid for in full for the samsung 6k which was R2999 and was informed there was enough stock. How can Game sell items that they don't have. I have been more than accommodating and now I am just frustrated that I have to live without these appliances that I have paid for. I need the washing machine to be delivered to me by latest Tuesday the 1 March or I will pursue legal action as you cannot sell items that you don't have, the oversell is your problem not mine.