BSNL — regarding to refund of rs 42 charged by you for prbt without my consent.

Dear Sir/mam,
My BSNL mobile no. [protected] has been charged by Rs 42 for the activation of PRBT which was activated without my any consent.
As I have talked to customer care of BSNL he has directly ignored me for giving me refund.
I have activated bsnl tune when my balance was Rs 2.Then a msg has came informing me to activate it when the balance is suffucient.but I had already deactivated it then also after 1 day when I recharged my balance ''IT APPROVED THE PRBT SERVICES WITHOUT MY CONSENT''
It is a cheating by the company to the consumers It is company's mistake for sending the SMS of PRBT activation as an advertisement.
I want my refund of Rs 42.

Thanks and regards,
customer.