Reliance Communications — services activated

I m using reliance cdma cell connection since last 6yrs.
My entire network was connected to reliance as my family, relatives friends too were having the same network operator.

Many times i have noticed that the balance gets low without making any calls, when complained to the customer care they says that some services are activated(caller tune, astrology...)
every time i have heard this stupid answer from them.we cant argue with them b'coz there is no option, they thinks that there system is always right.but i cant understand without activating any of the service how it gets activated.

when i purchased reliance gsm connection, it was height.
my Sim card was in my pocket for 15 days, as i was not using it, even during that period my balance was deducted, when i asked for that, they told me caller tune is activated.how come its possible that service can be activated when the Sim is not inserted in the phone.