Airtel
Unnecessary services which eat up my entire balance

I am an MBA student, I took an Airtel no, After 3 months there were some SMS on my phone about some services and they wrote in that "if you want to stop these sevices SMS 'stop' to this no" and when i did that msg came "the service cannot be stopped"

now it happened many times and now whenever i recharge my no. these messages come and eat up my whole balance, name of services are

1. AL ENTERTAINMENT

2. JOB ALERT

3. JOKES

etc

I am really frustrated, as i am a student i cant afford to recharge my no. every day.

I have tried calling customer care, but there is no option given to talk to Airtel people

please help me..