Where a customer has been required to make a deposit, that deposit shall not relieve the customer of the obligation to pay the service bill when due, but where such deposit has been made and service has been disconnected because of nonpayment of account, then unless the customer shall, within seventy-two hours after service has been disconnected, apply for reconnection of service and pay the account, the account may be discontinued. If the telephone utility discontinues the account, the telephone utility shall apply the deposit of such customer toward the discharge of such account and shall refund to the customer any excess.
S.C. Code Regs. § 103-621.7