Maruti Suzuki India — Reg. registration fees of car through csd canteen

Address:

Gurgaon, Haryana, 123027

I mr. Sube singh yadav purchased a wagon r vxi through csd canteen from dinco 4 wheels rewari on 17.07.2016. Now i went to rto office of kanina authority for registration of the same. The rto office demanding road tax on the ex showroom price in normal category instead of actual invoice on csd rate. However in rewari and gurgaon of the same state accepting road tax on the actual invoice of csd price. Please clarify about the same at the earliest because due to this i have to paid approx rs 2500/- more than the actual tax.