Airtel
Extra money paid as bill was not refunded

By mistake, I paid Rs 6000 extra im my internet bill (AIRTEL), and the money never came back. After 6 months of logging request for connection closure, and logging around 20 requests (which were automatically closed every time), i have still not received my money. Instead the money to be refunded has now been reduced by their system to 5192. I have dropped many many emails to them, but finally have stopped getting replies.