What would i do if a girl slides her leg wantedly in a cab daily?

A girl was supposed to sit against me in the backside of the cab daily, it was Toyota Qualis and we are on the back side. So we should have to face each other. Then first few days are okay then she started to touch and rub my legs with her legs. What should i do? I cant control my nerves and also she is aged than me .....................