HDFC Bank — Pathetic process for credit card upgrade

Address:

Pune, Maharashtra, 411028

Some relationship manager calls me up and offers Credit card upgrade, to which I agreed.

After few days someone calls back again referring above conversation and asking my personal information for verification. I denied to give the info and lady arrogantly says that if I do not give information she cannot process app and hungs up the phone.

I do not know whether that was legitimate call from HDFC or not. If it was legitimate then its a pathetic process where in some calls you and asks for personal information like date of birth.

I want to escalate on the process and persons who called up and spoke arrogantly.