Hero Motocorp — Lubricants leakage in engine and gearbox

Dear sir/madam I am Gaurav . I have purchased hf deluxe bs6 bike since 13 months . But now I am face one problem oil leakage . All services done by Authorize work Shop by hero motorcorp as par follow term and condition . Last service 24/08/21 done by dev vahan motors palwal Haryana after service one issue created oil leakage . Now today ( 31/08/21) bike under maintenance in dev vahan motors palwal Haryana . His work Shop department head tell to me that your bike engine cylinder create noise . So humble request to you that I want to know that how can create engine noise after that all services or maintenance on time or as per company terms & condition. So plz revert me what is the solution or problem
Thanks & Regards
Gaurav Bastta