Trai — airtel prepaid complaints

Address:

533003

Sir,
Airtel prepaid customer care number 121 is not having any provision for customer complaint. It has (1) select language,
2-my airtel offer
3-balance and validity
4-easy recharge
5-value added services
6-dnd
7- fixed line and bb
In the above situation, where customer will give complaint?
What is the use of customer care number with out facility for complaint?
Pl look into the matter and help the customers.