Why is my data so high all of a sudden on my iphone for at&t?

So a fee hours ago my data on my iphone 5s reset and i was on facebook for 30 min and it used 40 mbs and its never done that before, i have 8 gb a month and its already at 147mbs i know about turning off data for apps and everything but like my apps such as kik and safari and facebook are useing way more data than usual, like insanely more than usual, i've restarted my phone closed apps turned on and off data for apps and even the data itself, i've reset network settings and closed apps and monitered everything, but i swear they are using way more data than they should, the account is my grandmas who is out of state and isn't very educated on phones and plans and data so i can't really get her to help, please help me, what can i do to make these apps not use so much data, i've barely even used them and have closed them when done, i'm like legit scared to use my phone, because its all i have to do because we just moved and have no cable or Wi-Fi, please please help me find a solution or give ideas… Thank

What you have been doing with turning off your automatic updates and data when you are not using it is all you can do.

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