You were denied of your credit card application on your vacation for reason you do not know?

I APPLY FOR THE CREDIT CARD AND GAVE ALL THE INFORMATION INCLUDING MY CONTRACT WITH STIPULATED SALARY BUT I WAS INFORMED(THROUGH PHONE) THAT THE BPI MAIN OFFICE DENY MY APPLICATION BUT DID NOT ELABORATE THE REASON AS THEY ARE NOT ALLOWED TO DO SO.NOW I AM BACK HERE IN MY JOB IN AFRICA WHERE I WORKED FOR 8 YEARS ALREADY.HOW CAN I APPLY FOR THE CREDIT CARD?