I guess only Idea has less critics.
Idea is also a badmash company.
I bought an idea prepaid simcard only to make few isd calls as it was not activated on my postpaid number.
Within a month, i was automatically subscribed to something called "College funda" and Rs. 10 gone..
When Ind-Aus test started on 26th, then my number was suddenly subscribed to some cricket alerts.
Idea's customer care in spoke in very rude manner. They told me that I "MUST" have dialed some USSD code. I asked him to tell me what exactly i dialed.. He kept repeating USSD.. USSD.. and never beyond that. He refused the refund flatly.
I then connected them again and this time I really scr** them by being aggressive and demanding the refund. I reminded them that their salary comes from such haram ka paisa. I said I can go to any level even for Rs. 20. Then the call was transferred to a superviser. She then apologised multiple times and agreed to refund the amount by registering two complaints.
So friends, this is how it works.
I have experienced similar things on Idea, Airtel, Vodafone,
Tata docomo. They all do it.