Been there, seen that, had the hassle of getting it back. Though mine was for Vodaphone, a sneeky little £20 top up nine times over 3 days at Easter. Even with the card stopped another five went through, new card new number and all the problems that entails.
When I phoned up Nationwide, it started out like they did not believe me but some raised voices soon sorted that out. Swimbo thought it was great fun as I could not buy more bits for the boats without asking her
Honest officer he only tripped up the baseball bat
Brian