Indian Railways — Coach Cleanliness

There are lot of cockroaches in 12785 KCG Mysuru S5 Seat/Berth 3 which didnt allow me to sleep as its totally unhygenic, there is no OBHS in this train and not sure whom should i Approach to complain this about. We opt for train reason being comfort but issues like this put us in total discomfort. Sample picture attached as proof and reference. Indian Railways should seriously think on cleaning these coaches before journey and not just concentrate on remodeling .