Honda 2 Wheelers India — Oil burning in engine

Sir i have purchased honda cb unicorn 150 in november 2013 at sai honda barshi tal. Barshi dist. Solapur State. Maharashtra it have problems since i purchased now oil in the engine is burning engine makes noise i have cotacted service center but they told that they cant repair it in warranty. Hw is this possible? At purchasing time they told 5 yrs warranty and now just 2 years 7 months passed i want service in warranty.
Yours faithfully
Sunil s ukirade
At.post agalgaon tal barshi dist. Solapur maharashtra mob [protected]