Mahindra And Mahindra — Break related problem

Address: 411017

I was serviced my new vehical from sahyadri motors swarget pune, from an autorised delearship of mahindra... On 4 servicing in this delear ship they cut my rear drum brek without my permission... Afyer it i am facing problem from 2.6 years... After breaking vehical rear wheels cant stop they skets every time or one side wheel locks very fast... For this problem they dont have any solution they replaces my drum brake in warrenty but still this problem i am facing till now...