Night surfer data is ***** ...lies lies !!!

I have lots of night suffer data bundles which according to Telkom are accessible from 11:00 p.m - 7:00 a.m , however this is a lie. I was shocked last night to realize that the data that i use during the said period deducts from my normal monthly data and was shocked to get notification that am left with 600MB . When i checked the balance i realized that i have lots of “night suffer “ data which doesn’t make sense to me.