From CBS News:
A growing number of con artists are going old school by trying to rip off consumers over the phone, according to the National Consumers League. The group, which tracks the nation's most common frauds, says in a new report more than 36 percent of consumer complaints registered in 2013 involved telemarketing fraud.
Overall, the nation's most prevalent scam remains a fake check con, which involves "overpaying" for a product or service and asking the recipient to refund the difference. By the time the victim realizes that the check used for payment was bogus, the con artist has walked away with the consumer's money.
full article at:
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P.S. I still get calls from Heather at "Credit Card Services".