No assessment or act relating to the assessment or collection of any sum of money for any work done by the city official under the provisions of this chapter shall be illegal or void on account of any informality in connection with the levying of the assessment or the doing of the work or because the work was not completed within the time required by law. Any payment erroneously paid or illegally collected under the provisions of this chapter may be refunded upon an order of the council after a proper showing of such erroneous payment or illegal collection. Any claim for any such refund shall be verified and filed within ninety (90) days after making the payment sought to be refunded. (1962 Code § 5-5.310)