HDFC Bank — hdfc bank hdfc credit card "disapproved"

Hi,
HDFC Bank Agent call me and offered me to apply for credit card. I applied for credit card on 11may 2019 and got reference number after 1 month I got message that "We have completed processing your HDFCBank CreditCard 1*************" but today I have check with reference number then status "disapproved".
Why this will happened to me . Firstly your employees calls customer to apply for credit card .then customer apply it will rejected by bank Agent. And again and again call to customer to apply for credit card.
If customer is not eligible Then why you are call for the all the nonence thing.