Help: BSNL free caller tune

I did a recharge of 94 in my BSNL sim, which offered 60 days of free PRBT (caller tune). I set a caller tune in my number..

Now my questions are
i) after 60 days validity over will they deactivate the caller tune by themselves or they’ll keep it activated and charge for it

ii) if they don’t deactivate it, how much will they charge for it?

iii) and how can I deactivate the tune before 60 days, that it don’t charge me for renewal?

iv) and if I set a tune with my name or those tunes of jokes during this 60 days, is there any extra charge for it or it’s also free