Order not delivered yet

I bought a base set at retailer. On the day of the purchase, I made the sales consultant well aware that I wanted my base set immediately, as I have a serious back problem and needed the bed urgently. He said that the bed will be delivered to me in two week's time at the most. It's been a month already and still no base set! Every time I phone to enquiry, they have another excuse!! What is even worse, is that I already had to pay the first instalment for merchandise that I don't even have!! If the retailer made me aware from the start that they won't be able to deliver my goods in the 2 week's promised time, I could've gone somewhere else as I desperately need this bed with the back problem I have. This retailer is in one of the \up market"residential areas"