Hero Motocorp — Product complaint

Address:	Dungarpur, Rajasthan, 314025
Website:	www.heromotocorp.com/en-in

I am yogesh kumar sevak from sagwara, dungarpur, raj .314025
engine no.-ha10eyf4k01657, chassis no. - mblha10cak4k1643
reg.No. - rj12sp9537 . I bought this bike on 26/08/2016.
but felt many time that it`s chain system is loose, i tight it many time but it get loose .When i go to service they assure me now its but it still loose, it is factory fault so what to do ?
and what is this bike`s actual price bcoz showroom opt rs.61500 thousands in one month of delay payments...
dear sir, i complained on 07 jan, 2017 but i did not get any solution from you
now what should i do ?
mob - [protected]