Attorney General Mike DeWine said his office received more than 2,400 collections complaints in 2013 and hundreds related to phony claims that consumers had owed money.
The office said those who fall for such scams often report losing $200 to $300, though some lose thousands.
DeWine said the scams typically begin with a phone call from someone who says the consumer is in default on a loan. The callers will request immediate payment and refuse to provide documentation of debt.
However, DeWine is reminding Ohioans that third-party debt collectors must send a letter within five days after first contacting the consumer by phone. And the collectors cannot contact consumers without identifying themselves.