ROANOKE, Va. (AP) — Appalachian Power is warning small business customers in Virginia about a scam. The utility says some businesses have received calls from scam artists posing as Appalachian Power representatives. The callers threaten to disconnect service if payment is not received. Victims sometimes are directed to buy prepaid debit cards to make the payment. Appalachian Power spokeswoman Jeri Matheney says the company does not demand payment in this manner. She says anyone receiving such a call should hang up and call the company at the toll-free number listed on their bill or call local police.