[Resolved]  Bajaj Platina — mileage problem

Address:

Amravati, Maharashtra

purchased Bajaj platina 100 CC in may 2012
. . I was assured an average of atleast 85 kms. was told you will get the average after 4th servicing. I am still getting the mileage at 48-53 Kms. I would like to know What I need to do legally (In case the problem is with bike). What I need to check or take care of to get the average ?already check the bike to service station 3 times