Problem solved, i got the registration number over the phone. I can't be angry anymore, maybe the "ridiculously bad" was a bit too much but that was the impression i got due to the unanswered emails etc.. Now i know the support itself is good but it's just hard to get. :)
If online registration does not work for some people something should be done about it. I've haven't got any email filtering going on at least nothing that my ISP admits. I tried to use other email account but could not as the serial was already registered. Cakewalk's announcements and ads come through ok, so i guess it would not be a big change to use a working mail server (or whatever) for the registration emails.
I'm not happy about calling to Microsoft either after every reinstall of windows but that's another story, with microsoft i guess the people can't make a difference anymore, with cakewalk there's still hope, that's why i posted here. I guess i'm against obligatory registration in general, it does not really work against illegal copying anyway, so in my opinion there are no winners here. Maybe they're after user statistics and email adresses i don't know.
Anyway, sonar works and the studio is back on the track. Have a good time making music you all!