Why is my ZTE Cymbal using all my data?

I transferred my old phone number to this phone but shortly after, my 1.08 GB of data had gone to 0.  I contacted Tracfone because I thought they messed up something in the transfer.  They added another 1.46GB (not sure why that amount) but within a few hours it was at 0 again.  Went through the process again.  This time, I checked the data left after a shorter amount of time and saw that it was down to around 700MB.  Looking at the data usage, Google Play Services showed that it had already used over 3GB of data today!  What's going on and how do I fix it?

Go to Settings > General settings > Mobile networks and turn it off. I think you have accidentally turned it on.

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