@Disgruntled_1 you sure you still have data left? Please login My Account using Incognito mode to check agian
If it shows you still have data, and if you have Android, can you confirm if you have setup any mobile data limit like this one:
If you have no data limit, can you confirm if your voice are text are both working?
Try, rebooting device and resetting network connections.
If it persists after the above, ask a customer support agent to see if they can assist.
To contact a Customer Support Agent, there are 2 methods:
Watch for their response in your Community private mailbox which will be indicated by a number on the small envelope icon to the left of your Community avatar.