Hero Motocorp — maestro engine have problem

Address:

369, 7th marg, Rajrooppur, Allahabad, Uttar Pradesh, 211011

I bought maestrro scooty in jan 2015 and so far it has only 18000 km. Recetly i observed it sound is changed little bit and also have dense smoke when i contacted hero motorcorp they said these is problem in engine. Engine have five year warranty but they are reluctant to fix it. As a customer, i expect they will fix this problem as soon as possible,