S.C. Code Ann. § 15-75-51

The penalty provided by Section 15-75-50, including injunctive relief, may not be imposed unless the person who is alleged to have violated that section does so after being instructed, (1) in writing, (2) by telephone, or (3) by a machine that electronically transmits facsimiles through connection with a telephone network, by the receiver of the unsolicited advertising material not to transmit the material.