Selling stock that they do not have

I ordered online and was given a date for delivery - I waited for the delivery and then suddenly I was told that the supplier can no longer supply my product. I requested an alternative product and waited and waited for feedback: if the supplier can supply the "new" product. I received no response and then later on I requested my money back. I am being ignored!! This was suppose to be a birthday gift the birthday is long gone and I am still without gift / money.