“(2) If the party's address for service after the change of representation will be different from that which applied before the change, the party must also serve a copy of the notice at the address that was, immediately before the change, the party's address for service.
“(4) For the purpose of the proceeding, the change of representation takes effect on the filing of an affidavit proving service in accordance with subclause (1) and exhibiting and verifying a copy of the notice served.