HDFC Bank — In regarding with credit card declined

Address:

mohopada branch

I got a credit card offer on my hdfc net banking and i applied for it after that i got a application reference no. and it tells a it will process upto 7 working days and 4 days later when i track my application then it shows that my application is declined with no reason provided and i immediately visited the hdfc bank and they also not telling me what exactly happened. i got very disappointed with hdfc services