(a) Whenever the amount of any tax has been overpaid or paid more than once or has been erroneously or illegally collected or received by the City under this article it may be refunded as provided in this section. Except as otherwise provided in this section, refunds of overpaid taxes shall be made in the same manner as is provided in Sec. 21.07 of this chapter for refunds of overpayments in Business Taxes.
(b) A retailer 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 Director of Finance that the person from whom the tax has been collected was not a user or consumer as that term is defined in Subsection (b) of Sec. 21.8.1; 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 purchaser erroneously required to pay the tax or otherwise credited to him.
(c) No refund shall be paid under the provisions of this section unless the claimant establishes his right thereto by written records showing entitlement thereto.