I gave a deposit of 50 for a modem when I signed up for an internet connection 6 years ago. I have given them 45 days notice that I want to cancel my account. They have told me they owe me a deposit of 46.95 (I don't know why they have deducted 3.05) and they have also informed me that they won't return my deposit in cash, but instead by bank transfer (and they are charging me a bank and administrative fee of 8 pounds for the privilege because"A standard bank & administration charge of 8.00 applies on all transfers.") Can they do this?