HDB Financial Services — Fraud at singla auto agencies chhapraula ,gautam budh nagar,uttar pradesh

I am mrs shivpalni mishra a housewife and i went to buy splendor plus self start alloy wheels bs6, the ex showroom price for tha bike was 65975 i purchased the bike from showroom but they made the total amount 81900 in which they forcefully took handling charges which was 1100 which is only applicable when u get the delivery of the bike at home, they gave me the insurrance from two different insurance companies, and then i optrd the option to buy the bike on emi, then took me to hdb financial service representative mr mandeep chauhan, i told him that i am willing to pay 20000 as downpayment and he took my documents and took my sign on many documents for the finance, the left amount was[protected]= 61900, he suggested me to take 3 year plan, i agreed and chose the plan for n rate of interest of 11.99% per annum, he did some random claculation and gave me a slip 2749 written as an monthly emi amount .when i asked him that how the emi got 2749 rs he did not ellaborate and said these are bank rules and i can not axplain furtherand i got a message on my no. that my loan is approved with hdb financial services ltd. with loan no. 16697415, and i was given the bike without any accesorries fixed, and i went back to my home, i checked on hdb on the go app and got shocked as the loan amount was not 61900 it, was 70161 which was paid to the agency, when i objected thus with the showroom manager mr. dinesh they harrassed me by saying that you will loose your 20000 rs of downpayment and the bike also, i have sent e-mail to hdb financial service about this but haven't recieved any reply.kindly help me out of this fraud.as they would have done this to many customers, and keep threatning me of taking the bike if i oppose them