Be careful! Don't use online top up and give your ...

Be careful! Don't use online top up and give your bank details! So difficult to stop! If you've got account you can press unsubscribe and for 'unknown' reasons it's On again next time you check your profile. Customer Service Help line doesn't exist! No email, no chance to speak with them for help! I'm currently communicate with them by sending letters to post address in London which takes ages!!!