HDFC Bank — top up loan foreclosure charges - misleading information

I was offered a 'top-up' loan in dec 2017. Was promised by the agent that there were no foreclosure charges after 6 months. When i went to foreclose in august, they said there was 8% charge. 2 months of escalations, the bank says produce something in writing - while they did not even make a copy of the declaration i clicked on available to me for reference (Even requesting them -
They haven't sent) they have no means of holding it's sales people accountable for the false promises they make just to sell a loan.
To my escalation email on the 12th of september, the nodal officer says the charges are 6% and 27th september they say 12.75%! (Maybe because i had escalated to the banking ombudsman). Misleading information at all levels.
Hdfc escalation number - hbl=[protected].