If any operator required by this Chapter to file a return shall fail to do so within the time prescribed, or shall make, wilfully or otherwise, an incorrect, false, or fraudulent return, the operator shall, upon written notice and demand, file such return or corrected return within five (5) days of receipt of such written notice and shall at the same time pay any tax due on the basis thereof. If such person shall fail to file such return or corrected return, the City shall make a return or corrected return, for such person from such knowledge and information as the City can obtain, and assess a tax on the basis thereof, which tax (less any payments theretofore made on account of the tax for the taxable period covered by such return) shall be paid within five (5) days of the receipt of written notice and demand for such payment. Any such return or assessment made by the City shall be prima facie correct and valid, and such person shall have the burden of establishing its incorrectness or invalidity in any action or proceeding in respect thereto. If any portion of a tax imposed by this Chapter, including penalties thereon, is not paid within thirty (30) days after it is required to be paid, the City Attorney may institute such legal action as may be necessary to recover the amount due plus interest, penalties, the costs and disbursements of any action. Upon a showing of good cause, the City may grant an operator one thirty (30) day extension of time within which to file a return and make payment of taxes as required by this Chapter provided that interest during such period of extension shall be added to the taxes due at the rate of ten percent (10%) per annum. (Ord. 576, sec. 1, 4-15-1996, eff. 6-1-1996)