My data allowance resets on the 19th of every month. I have a 20GB allowance, and I usually barely use a quarter of that. Yesterday - 19th March, the first day of my new month - I get a warning from O2 that I've used 80% of my allowance and have under 4GB left for the next four weeks. Whaaaat?! How is that possible? If this is a fault, I need it to be fixed ASAP. Help!
