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It's not First Year Free card, still 7999 + 18% GST will be charged in first month/ first statement. They will check in 90 days since the card was allocated if you have spent more than 1.25 L or not.
If spent then they will reverse the charges that too after 90 days otherwise they won't.
Do keep in mind that different banks have different policies regarding first 90 days
Some have a policy of considering 90 days since the day you can transact with your card (using e-version of your credit card ) regardless of whether you received it or not others consider first 90 days to be the day since you have received your card.
Contact AU Bank support team and find out which 90 days is applicable.