I deleted all my mail on my iPhone and yet it still says I'm using 12gigs of data in mail?! I tried restarting the phone but it didn't work?
I went onto the desktop site and deleted all the phone, deleted the account on mail and re added it but to no avail, it still says I'm using 12gigs of data in mail which is insane. How can I fix this issue? I'm using an iPhone 6 with the latest update (9.3 I believe)