Had a similar problem myself a few months ago. Residual nameserver information staying on their internal dns servers (which loads of people in ireland use). I've a contact, phone number and fax number somewhere in an a4 pad. I always keep these pads so you might be in luck. I'll have a look tomorrow for ya and send it to you if I can find it. It took me ages to get through to the right person. If I remember correctly, she will fax (cause they don't know how to email it) a form that needs to be filled out and signed by your client and get that into them. It'll take a few days to go through knowing them. They lost my form twice that I sent in so keep hounding them. Anyway, enough of my rant... I'll look that up and get back to you in the morning.
Dave