Yes Bank — not closing my car loan

I took car loan from ulhasnagar yes bank branch in nov2016. Before taking any loan i talk with trupti parab regarding terms of the loan.in that when i asked about forecloser she told me u can not close it till 6 months as it is locking period and after that i can close it at any time. The form i signed also did not contain any chrges on it. The column was empty. Now i requested for forecloser, they r demanding 5% penalty. They showed me form with my sign contain forecloser penalty written by hand on it after my sign. I m behind this people for closer since jan2018 but nobody is listening. First i was behind trupti parab by means of sms, whatsup, mail. Then yes bank customer care by means of call and e mail. Then went to head office for payment there also they refused payment. Then mr. Kamran by means of sms, whatsup, e mail, later he also stop responding me. Then i lounch complaint in rbi they gave me e mail address of mr ratan kesh a nodal officer for yes bank. I send mail to him. He replied saying will settle it in 5working days, still the situation is as it is. Now every other day diffrent diffrent guys calling me saying i hv to pay inrest, penalty till date or my cibil will spoil. On asking what about intrest paid unnecssary by me due to their fault, they said its non of our buissiness. I m thinking of going to consumer court. I hv all documents of above communications. I want wavier of intrest after i requested to closer and penaltyalua