We had a number of personnel changes in our startup back in December. One of the people who left the company was our Chief Product Officer, and the account owner for our developer account. I have admin privileges but need to change the ownership to me so I can pay the renewal fee and conduct other tasks associated with account owner. Our prior employee cannot be reached. He has gone off-grid it seems and is not responding to our inquiries and pleas for help. Who can I speak/correspond with at Apple to get this account updated to reflect our new organization?