Bloody credit cards

When I arrived in the US eight months ago, I applied for a credit card, but was turned down on the basis that I had no credit history in the US and was told it would take at least a year to build it up sufficiently.

In the last few months, I have received three letters from the Chase bank asking me if I would like to apply for a "Platinum" credit card. Each time, I have torn up the contents and envelope, put this in the postage paid "priority" return envelope and sent it back to them. When will they learn?