Extreme amount of data usage: 1000 MB used in 8 minutes?

For my iPhone I have a plan of 2000MB a month and I try to keep the usage down by only turning on 4G when I really need it and only one app at a time (and I'm usually connected to Wi-Fi). But in the last two weeks I have somehow used 11,000 MB of data. (It adds another 1000MB each time I go over.) But I have gotten notifications that I have already used another 1000MB within 10 minutes of eachother when i have NOT been using my data. I'm definetly going to change my plan now but I just want to know if this is my fault of a flaw from AT&T? Because I really don't want to pay an extra $135 for the extra data charges

I would call at&t, not sure why you are asking that here.

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