HDFC Bank — Credi card application

I got a call from hdfc bank on 8th of December and they told me i got a credit card offer and it’s pre approved and then the asked me to submit the documents and after that there was no communication for 10-12 days after that i got a call from hdfc bank recorded line for verification and I asked them when will i get the card and the told me i will get my card in 7-8 days. And today i got a mail from hdfc bank that my application is rejected.