No monthly airtime

Hi <br> <br> Vodacom I called the centre at 13:00 to complain about my monthly airtime. this is the second time it happens.<br> Thabang told me that I was on the internet on the 29th February at 24:30 that is way i don't have airtime, Strange cause this is the second time it happens. Vodacom I'm tired of complaining and getting the same story over and over again. The time of using that airtime I was asleep and my mobile data was off. So where did my air time go?<br> <br> Dankie,