An operator may claim a refund or take as credit against taxes collected and remitted the amount overpaid, paid more than once or erroneously or illegally collected or received when it is established in a manner prescribed by the tax administrator that the person from whom the tax has been collected was not a transient; provided, however, that neither a refund nor a credit shall be allowed unless the amount of the tax so collected has either been refunded to the transient or credited to rent subsequently payable by the transient to the operator. (Ord. 781 NCS § 1; prior code §23.24(b).)