The phrase "fraudulent calls" is correct and usable in written English.
It can be used when referring to phone calls that are deceptive or intended to trick the recipient, often for financial gain.
Example: "The company has received numerous reports of fraudulent calls claiming to be from their customer service department."
Alternatives: "scam calls" or "deceptive calls."
(AP) THE TACTICS PHONY CALLS -- The N.A.A.C.P. said yesterday that black voters in Virginia and Michigan had received fraudulent calls in which someone claiming to be from the organization urged the election of Gov. George W. Bush.
It's the fraudulent calls that are becoming more numerous lately.
But, Mr. Searcy said, there are also "prerecorded messages that have been used for fraudulent calls because they're so cheap".
Her agency learned of the fraudulent calls when people hung up on the fake census workers and called her office to complain.
Thereafter, the identification of the fraudulent calls occurs in two stages.
The use of unsupervised quarter sphere support vector machine (QSSVM) has been suggested for identifying the fraudulent calls in [39].
Mr Tsvangirai rejected the results as fraudulent, calling for fresh elections following what he described as "political theft".
After receiving such a fraudulent call, Graeme Smith, from Chester-le-Street in Co Durham, lost £2,815 from his Santander account.
Once people appear on a "sucker list" as having responded to a fraudulent call or mailing, con artists will pursue them.
The officers initially believed the rig was used to run a fraudulent call center, a common crime in Southeast Asia.
In a ruling on Feb. 13 that lawyers for the defendants said was an important precedent, the United States Court of Appeals for the 11th Circuit in Atlanta, which hears appeals in federal cases from Florida, said that plaintiffs in a case involving fraudulent telephone calls "bear the burden" of proving that each person was damaged.
