Airtel — disappointing customer service

I have a postpaid number of [protected]. The airtel internet service is getting worse day by day. So, i called airtel customer care of airtel in order to deactivate the number to go for other options. It took 20 minutes just to get the customer executive on line and then after sharing my problem and requesting for cancellation of sim i was told i will be transferred to the supervisor but the transfer was never made. I called multiple times over a period of 3 hours and everytime instead of being transferred to the supervisor the call would get transferred to another executive and sometimes the call was even disconnected but my complaint was never resolved. For someone claiming to be the fasted in their field airtel is really disappointing both in terms of the service the offer and their customer care.