Every telephone corporation shall permit a residential customer to designate a third party to receive all notifications relating to suspension and/or termination of service or other credit notices sent to such residential customer, provided that the designated third party agrees in writing to receive such notices. The telephone corporation shall inform the third party that the authorization to receive such notices does not constitute acceptance of any liability on the third party for service provided to the customer. The telephone corporation shall promptly notify the residential customer of the refusal or cancellation of such authorization by the third party.