Reliance India Mobile — deduction of money without my knowledge

sir,
the said company has deducted Rs.30/- from my account for caller tune which I'dnt activated.when I complained this to thier customer care they said it was done by mistake and they will deactivate the service n remitt my money to my num.but what they did is they deactivated the service but said it was done by me n they will not refund the money.When i said them that this is not true they said we cant do anything n u do whatever u wish.