preferred

I was an HDFC Classic customer till recently. Today when I logged in to my account I see that it has been converted to preferred banking. I don't remember getting any details on this. Any idea if there are any change in terms? like Min Balance etc So I need to check with them for anything?

Hello there after posting here and getting suggestions I opened account in HDFC for my salary as I wanted DCB later. Also I received my salary in the same account recently. I read on the forum that by maintaining some amount in account we can ask for preferred upgrade. I asked the person who...