Mahindra Two Wheelers — my gustro uz buy just 3weeks while bike suddenly off

my mahendira gustro uz bike i bought in before 3 wks when i run this sometimes it off sudently dat time doesnt the bike will start but not move r rise i given dealer they just do something and given but offently the same mistake take place i complain a customer they do not yake action .so i need my full money they just repay my money. One day the scooter will stopon night 9clock outside city i am a girl wat can i do that time it is very risk to take dat scooter, am from tamilnadu, thiruvannamalai city, dealer is varma motors