S.C. Code Ann. § 31-3-1660

An obligee of an authority shall have the right in addition to all other rights which may be conferred on such obligee, subject only to any contractual restrictions binding upon such obligee: (1) By mandamus, suit, action or proceeding at law or in equity to compel the authority and the commissioners, officers, agents or employees thereof to perform each and every term, provision and covenant contained in any contract of the authority with or for the benefit of such obligee and to require the carrying out of any or all such covenants and agreements of the authority and the fulfillment of all duties imposed upon the authority by this chapter and Chapter 11; and (2) By suit, action or proceeding in equity to enjoin any acts or things which may be unlawful or the violation of any of the rights of such obligee.