|Get back to Vodaphone and explain the problem just like you explained it in your post.|
They more than anyone should know how to deal with a problem on their own NUC form!
When I wanted an unlock code from O2, I sent them the phone's IMEI number by email and they replied with the unlocking code. Couldn't have been any simpler.
So I don't why Vodaphone wants your mobile number, it's the actual phone you're unlocking (which is why it's IMEI is required), and that's got nothing to do with the phone number.
message edited by phil22