Bajaj Finserv — Charging foreclosure while it was mentioned free in the offer

Address:	110030
Website:	loan-customers.bajajfinance.com

I took Personal loan from Bajaj Finserv where they gave me written promise that they will not charge any foreclosure charge.But now at this moment they are asking almost 15000 INR for foreclosure charges, i have contacted their call centers etc but no one is helping and adamant to charge it, also i logged complaint more than 1 month ago, so far they did not give proper reply, it seems they want to prolong the discussion so that i can keep paying installment them and do not foreclose the loan, Now from few days i am trying to pay whatever amount they have on me (including foreclosure charges) but their application is not allowing online payment which also seems their delibreate action to prolong the transaction. I have complaint to many but no one is listening, I want to go to court but if you could help me here it will save my time and efforts.

Please help