Yes, I'm pretty sure customer services can see what has been charged to the card - although the guys in the shop cannot.
(info from the Vodafone Germany Support Forum)
So, you can either go to the shop and let them call customer services or call them yourself.
About the English... Being German I'm really ashamed that even thigh everybody learns English it is very hard to get around. Quite the opposite here in Sweden... Every room maid speaks better English than a lot of German Executives
