From the Millen Police Department:
We have been made aware of a scam in which callers are posing as City of Millen police officers stating that there are active warrants on the person receiving the call. They offer a resolution by requesting payment over the phone. DO NOT give out any information! If you have any questions please call the police department at 478-982-2750 or the Sheriff's Office at 478-982-4211
Original source can be found here.