Wrong data usage

I have logged a call with Telkom regarding wrong usage. When I use my night surfer data telkom is not using them is using my daily data, and I have logged a call regarding withthis issue. I am using wifi. I have noticed this for the past two months,. An agent that I was logging call told me to retstart the devive, that doesnt make sense, why do I have to restart the device anywa when I go to bed I switch my WIFI off. I want to see my usage this a day light ******* from Telkom. The call that I have logged no one has come back to me instead I am ****** here