Airtel — internet service is sloooooow

Address:

Vellore, Tamil Nadu, 635901

I've complaining to their customer service repeatedly but i don't think they have taken a step on this, it still is slow and not a slight improvement from them and it's really irritating,
so what i want now is refund my money on last transaction and i'm gonna change to other network
and SUE them please, they are the biggest cheaters in india i reckon