Hero Motocorp — Fuel Tank leakage

Address:

35 Parthala Khanjarpur Sector 122 Noida

Dear sir,
My new bike HERO HF DELUXE BS6
Bike Number UP16CQ4046
service in Dhanshree hero Agency noida Sector 63.
This is my 4th service from here.
At the time of service
They are not properly check my bike issues
My bike engine tank is leakage from its lower side.
They told me about it and they said it is a paid service
I paid and service my bike.
After 2 days it is leak again from the same place of engine.
I went to Agency to resolved.
Now again it is leaked from it fuel tank.
They said that it is paidable service
Actually mechanic has fix with fevi quick.
Now it is broken.
What i do in this case?
They said this accessory is under warrant in 5 years.
But if broken warrenty is gone.
Please help us
Azad Khan
[protected]
Noida