Do Not Attempt This! (If you don't know what you are doing). You will lose your peace of mind, mental health and sanity.
Believe me, I have tried this before. The issue that bankers these days are no longer bankers but insurance sales agents.
I went up to the Regional Manager in HDFC trying to get Infinia. It is so immensely frustrating that the moment they see you they go full on in selling insurance products. They don't even listen to what you are trying to say. "Sir credit card and all you have to pay interest. Look at this guaranteed returns plan. Blah blah blah". Even entering a bank branch is a stressful experience. People surround you from all sides. Even the teller will try to sell you insurance! And then they follow you home too! Your contact will be passed up the chain and in a short time everyone short of Sashidhar Jagdishan and Deepak Parekh will be after you.
Even if you ask for investment advice, they try to sell you insurance. You can't even get a person in a bank branch to have a productive or meaningful conversation! I tried talking to the BM and RM about investment and you can imagine how that went. When I insisted, they asked me to buy Regular MF schemes! In the end I gave up and signed up with Value Research Online for investment advice.
In the end, if you approach the average bank saying you are a HNI they will hound you until the end of days trying to sell insurance.