Hero Electric Cruz — I'm complaining about my cruze braking problem

Address:	M/S Loknath E-Tech Enterprise Nh-2 Gandhi More Durgapur Paschim Bardhaman Durgapur , West Bengal, 713203, 713205
Website:	heroelectric.in

Sir, i bought a hero cruz (Motor serial no. Lojc17h0206 and frame no. Hcz17k0101) on 23/03/2018 and have been having a persistent rear wheel braking problem (Too much sound when rear wheel brakes were applied). Initially the brake drum had sheared/broken, which was duly changed by the resp. Showroom in aug 2018. But the problem is still existing to this day, to which the showroom/dealer is not paying any heed to.
And secondly my li-ion battery had worn out within the warranty period on feb 2019, which was duly changed by the dealer. But i was charged a transportation fee (Rs 150) as well as testing fees (Rs 150). But no bill was provided to me.
So i would request you to kindly address my matter with utmost urgency.