Airtel Postpaid — Postpaid International Roaming False Billing

I had opted for a One Day International Roaming pack on my postpaid (account no.[protected] which was activated on 28th May.
However in my bill for May and June I have been billed multiple times for the "one day" pack which was supposed to be valid only for 24 hours.
I had opted for Rs. 649 pack however my bill is for 5772Rs.
My phone was switched off most of the duration of my stay and there was no usage made during roaming.
According to the terms and conditions of IR, the pack cannot renew itself once validity is over. How was it applied several times without my consent?

Desirable resolution : Need to correct the bill and remove inflated charges.
They have already deactivated my number without informing as well.