( KNZA)--It's a scam Westar Energy has warned its customers about before, and its happening again.

Westar and KCP&L say imposters claiming to work for the companies are threatening to disconnect service and asking for prepaid cards as payment.

In some cases, the caller is using a pre-recorded voice.

Some imposters are very convincing. They may use websites that allow them to manipulate caller ID, making the call appear to come from Westar or KCP&L. They may use a prerecorded message.  When the targeted customer calls the phone numbers provided, the person who answers sounds like they work for the electric companies. In some cases, callers may even provide information like amount due that makes them sound credible.

Atchison County Sheriff Jack Laurie local businesses have reported receiving such scam calls.

Westar spokeswoman Gina Penzig says the company will never require a pre-paid card for payment. Also, she says they will notify customers multiple times in advance if service may be interrupted for non-payment.