Telkom Day Time data been used instead of Night owl data

I bought a 80Gig day and 80Gig night owl data. This is not the first time but every time i want to use my night owl, it eats from my day time data.

Although it should not be needed to reboot my router when during night owl, I however wait till 10 minutes after 12am to switch of router and then after 10 minutes switch it back on as Telkom advised. But it still uses my day time data instead of my night owl. I am extremely upset about this. Even after chatting online with telkom technical personal I am getting nowhere wit this.