Vodafone Callya credit frequently disappears...
I have been using Vodafone's callya (prepaid service) when I visit Germany. When the credit gets low I get a notification and I usually charge it by 15e. However, when I charged last time, the credit become less than 2e after 3 domestic texts and one call (all in germany to germany, the data disabled). The same thing happened when I visited last year but I didn't have time to dig deeper. So this time I went to a Vodafone shop and explained my situation but the agent said there is nothing they can do because they cannot show my usage. And oddly, he said he is not surprised that my credit just disappeared, so I am left with the impression that this actually happens a lot. Did it happen to someone else? How should I go about this? Any ways to get my credit back or at least check why the credit disappears?