After some days of response time today I got an “answer” from Apple regarding my account paymant problem:
They just sent me the same two links to two non-related FAQ entries than they showed me automatically before I could fill in the contact form on the support sites. Obviously they did not even read what my problem was about (that I entered my new credit card information twice but that this information simply does not find the way in the Apple systems).
Apple – you build great computers, you brought us the iPod, you brougth style in our digital lifestyle – but please hire some smart web developers really able to build and run services like Mobile Me. It’s so annoying for customers having to contact you 10 times to reslove a simple problem!