I use call-by-call for internet access btw.
so, I called up BT Germany and all they said was "we'll check it"...I looked around on the net a little and found that I'm not the only one who has trouble with BT....I searched a little more and found the real owner of this service (BT Germany is just providing the network services):
Dr. Markus Beforth
this fuckin' criminal (nobody even knows where he got his Dr. title) tried similar stuff already in the past (on sexhotlines for example), I sent him a letter where I demand the full connection listings and a technical report which proofs the proper function of his service, both is my legal right as I found out.
the 2nd company (MCI) reacted a little different on the phone "oh, yes, we know we made an error"...and they said they would send the money back in 1-2 months (that's ridiculous), luckily I stopped the money transfers to both companies immedeately....I sent the same report requests to MCI too.
the fun part is that both companies are using the same company to retrieve their money: nexnet.de ....random? I don't think so...
well, now all I can do is waiting for their replies....

at least it was an opportunity to talk to my dad about my phone connection, he agreed with making a contract under his name for me with the german t-com (I had some trouble with them some years ago, so I can't do it by myself)...so I'll finally have a nice DSL connection soon...