Welcome to WebmasterWorld Guest from 188.8.131.52
Sounds like the change hasn't occured yet. If the DN was in transition you shouldn't have been able to upload to your old provider unless you're using the IP to connect with them. If you were using the DN and DNS had been changed then the upload should have failed.
Also, depending on who you're DN was registered with, they often use email to authorize the modification. IF the email address you supplied is incorrect, you'll never get the Ack (acknowledge) request and thus the modification will never get approved.
Do you know how to use ping? If so, ping your site and see what IP it returns. That'll help determine who DNS is pointing to.
I'm hitting the sack for the night but if you don't have this resolved tomorrow, sticky me with the URL and who the DN was registered with - I'll look into it for you.