go to your device and check out each app is take all data and you don't which one check them all app... and if you know you didn't used your data and is not showing i think you have to Contact Customer Support Agent by CS_Agent , and Explain your issue
they can solve your issue, they are nice Service Team they will help you 100%.
Here’s How To Contact Customer Support Agent by CS_Agent,
just to to refreshing your network,i know is not help but try it...
can you try to do one thing Make sure your phone is off before removing your SIM card,
and take your SIM card out and waiting for a 2 minute and put it back and turn on -This one is quick and simple.
what is mean for Rebooting the phone means to turn off your phone and turn it back on again.
@Tulahb : And under My Data & Add-ons on your self-serve, do you see a line mentioning data? And is your data still working?
If so, then it would seem it was a spurious text. There've been some reports of them. If the data is working and if it keeps working until it's done then I would ignore the text. Maybe at 750MB you'll get the 75% text 🙂
Edit: One doesn't always need to run to the CSA's for every little thing. We can give you ideas here or historical knowledge to proceed.
If you Plan Data is showing you have more data left on your Overview TAB of your Self Serve, then ignore those messages.
NOTE: data warnings will include your Plan Data as well as any of your Data Addons.
So, for example, if you have 1000 MB of Plan Data + 2000 MB of an addon, the you have 3000 MB total. And you will receive the 75% on the 3000MB.