You can answer your perosnal detailz like name, dob, country etc. The only thing different would be address, phone and email of your lawyer. I'm sure they have your address as well on the file and there are other things that they can ask to verify.
Whenever I call, they ask for application number, name, dob, address (which I tell is my representative's and give mine separately).
Just call, I'm sure you'll be fine