I keep getting a message to say I'm close to using up all my phone data but I know I haven't. I've purchased top up flexi data three times now but the second and third time I feel like I definitely wouldn't have used up all the extra data I'd purchased. I only got my last extra data early this morning and it's already telling me I've used 80%. Can anyone help? Rather not get a massive bill at the end of the month for stuff I haven't actually used.