HDFC Bank — Renewed credit card was returned to bank

As my current credit is expiring this month, hdfc had sent new one.
But i got message that credit card got returned and context to helpline number.
I contacted helpline but all automated replies said go to hdfc.com only
I checked address thriough net banking it is correct, but we did not receive any such delivery try. I do not know what is exact reason for delivery failure
Please let me know how should i proceed further