Received a Rollover SMS 5 days before my plan ends, why?

Hey people,
My Payment cycle ends the 7th Jan, today is the 2nd. Received an SMS saying: "You just got your first rollover" where they applied the remaining amount of data to my next billing period.
My question is: If Fizz already rolls over my data to my next period, then, what data am I using now and for the remaining 5 days of my current period?
Extra Question: Does Fizz automatically charge my credit card for the next period and when does Fizz do that?

Answers

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