Any county desiring to impose county sales and use taxes under this subchapter may do so by the adoption of an ordinance, stating its purpose and referring to this subchapter. The rate of the tax imposed under this section is 0.5 percent of the sales price or purchase price. Except as provided in s. 66.0621 (3m), the county sales and use taxes may be imposed only for the purpose of directly reducing the property tax levy and only in their entirety as provided in this subchapter. That ordinance shall be effective on the first day of January, the first day of April, the first day of July or the first day of October. A certified copy of that ordinance shall be delivered to the secretary of revenue at least 120 days prior to its effective date. The repeal of any such ordinance shall be effective on December 31. A certified copy of a repeal ordinance shall be delivered to the secretary of revenue at least 120 days before the effective date of the repeal. Except as provided under s. 77.60 (9), the department of revenue may not issue any assessment nor act on any claim for a refund or any claim for an adjustment under s. 77.585 after the end of the calendar year that is 4 years after the year in which the county has enacted a repeal ordinance under this section.