Honda 2 Wheelers India — I am complaining about my honda yuga bike

We are trusted customer of honda bikes. We had purchased a honda shine and used it for 5 years. Then your new model yuva was launched so as per the good average assurance given by your company we purchased it in 2015. The bike is regularly serviced at your service station at regular intervals yet it has developed some major problem in its engine. This according to the mechanic is a manufacturing defect. Also no guidance was given by the dealer for extended warranty. Now they are charging a high amount for the repairs. This is very ridiculous to have a bike with such a reputed brand to last for such a short span. I request you to kindly look in to the matter and forward my complaint and help to get the maintenance done at low cost.