It took a while, but we closed out 3 accounts & had the "preferred"/"classic" tag removed for 2 others. I am now waiting to see how we can get rid of HDFC bank as a whole at some point from me & my extended family's lives.
I have a preferred account, they did not do it automatically, i received email informing me about the charge and then there was i think a full one year where they waived off the charge , i do not mind the charge of 400 INR per year , when i get in return a platinum debit card with no annual fee and a regalia credit card life time free which normally costs 2500 per year