Airtel — excess data consumption

Address:

Vellore, Tamil Nadu, 632001

I have downloaded some 300 mb videos with previous day data usage limit i. E on 14.06.18 around 23.50, but along with 300mb previous day data excess 300 mb data consumed from next day data limit. We guys are keeping trust on airtel but this kinds of disgusting activities from trusted airtel provider makes very much uncomfortable. I have attached a photo showing that at 12.01 am data consumed is 330 mb. How is this possible?. I need an explanation for that extra data consumption from bharathi airtel. Kindly provide it as soon as possible.