Mode of service of unserved returned notices

²[Any notice directed to be served under rule 3 shall be returned, with or without service, to the Court within seven days of issuance; and if the notice is returned without service, the Court shall cause the notice to be served again within seven days thereof in accordance with the provision of rule 20 of Order V, so far as may be applicable, and such service shall be deemed as due service of the notice.]