Thats horrible..

If you have had ebay take money out of your account before, they leave a track number and you can contact your bank and they can block it.. Normally takes 24-48 hours for it to work..

Its been a while since I worked in a bank but I think it was called Direct Debit Stop.. Shouldnt cost you anything..

Thats the only thing I can think of from a banking side..

Good luck...