S.C. Code Ann. § 12-51-150: Official may void tax sales.

If the official in charge of the tax sale discovers before a tax title has passed that there is a failure of any action required to be properly performed, the official may void the tax sale and refund the amount paid, plus interest in the amount actually earned by the county on the amount refunded, to the successful bidder. If the full amount of the taxes, assessments, penalties, and costs have not been paid, the property must be brought to tax sale as soon as practicable.