Don't Call Back (2010)

Kevin is unlucky enough to work in the office from hell as a mailboy and has to suffer the racist taunts from his boss and the failure of the love of his life (the office babe, Tracie) to even remember his name. Things go from bad to worse when Kevin discovers that one by one, his fellow workers are being turned into Drones by a series of mysterious phone calls. When Tracie is threatened, Kevin takes matters into his own hands...