Bharti Airtel — slow data service

The data service of airtel in my area (Pathar quearry, harihar pur) is dead slow even in a 4g network for a long time (Almost 2 months). From 5pm to 10 pm the network speed is 10-20 kb. I just want a good enough speed. They charge for 4g speed but 20 kb per second is very frustrating. I contact the customer care but the speed is still same. So i request to make them to increase the speed by increase the number of tower or by other technical means.