I have just received four messages, all immediately after each other (i.e. within seconds). They say I've used 80% of my allowance, all of my allowance, 80% of my cap, then all of my cap.
Nothing was open or running on my phone and I don't see how I could have used more than 2GB in the space of a few seconds. Has something odd happened on the account? How can the data be re-added to my account?