PORTLAND, Maine — The Massachusetts man who owns Perfect Pleasures Escort Service in Windham, Maine, was sentenced Friday in U.S. District Court to 15 months in federal prison for making threatening phone calls to a former client.

In addition to prison time, U.S. District Judge George Z. Singal sentenced Nicholas Enfanto, 53, of Saugus, Mass., to three years of supervised release and ordered him to pay a $1,000 fine.

He pleaded guilty in December to one count of sending interstate communications with the intent to extort.

By pleading guilty, Enfanto admitted to making threatening telephone calls to a former client. The client is described in court documents as a Falmouth cardiologist who patronized Enfanto’s business and spent about $7,500 a month with Perfect Pleasures. The physician is not named but referred to as “J.D.” in all court documents.

Perfect Pleasures provides exotic dancers for individuals and private parties. Enfanto keeps one-third of the fees paid to dancers, who are considered independent contractors. What the dancers were paid is not outlined in court documents and not listed on the company’s website.

The investigation that led to Enfanto’s arrest on May 4 in Massachusetts began when Falmouth police on April 26 received a complaint from the man identified as J.D. in court documents. J.D. said that he had used Enfanto’s escort service for at least eight years.

The man told police that he never paid the escorts directly but mailed personal checks to Enfanto’s Saugus, Mass., address, according to court documents. On Feb. 6, 2012, Enfanto sent J.D. a text message on his cellphone that said he owed the owner of the escort service $100,000.

“Enfanto claimed that J.D. had contacted women from the escort service without going through Enfanto, and thus owed Enfanto for the lost business,” said the affidavit filed in federal court in Portland. “Enfanto made it clear that J.D. would be harmed if J.D. did not pay the money.

“J.D. admitted to me that he had met with escorts from the Perfect Pleasures Service without arranging the meetings through Enfanto, as the escorts had approached him on their own. They sold drugs to J.D. and told J.D. they no longer worked for Enfanto.”

Enfanto ended the business relationship with J.D. after one of the dancers who worked for Enfanto as an independent contractor admitted she had procured cocaine for the doctor.

“Mr. Enfanto informed Dr. John Doe that he knew of Dr. John Doe booking the Perfect Pleasures dancers directly, without going through the agency, and that he believed that Dr. John Doe owed the agency back agency fees for the previous eight years,” said the trial brief filed by Enfanto’s attorney, Peter Rodway of Portland. “Upon being confronted about booking the dancers directly, Dr. John Doe admitted to Mr. Enfanto that he had, in fact, been booking the dancers directly and acknowledged that he owed the agency money.”

J.D. arranged to pay Enfanto $250 per week on the debt by sending him checks or making cash deposits directly into Enfanto’s bank account through a branch in Maine, according to the prosecution version of events to which Enfanto pleaded guilty.

“Enfanto never made threats to expose J.D.’s use of cocaine or escorts to anyone; he only threatened physical violence if J.D. did not pay Enfanto,” the complaint said.

J.D. decided to contact police after Enfanto raised his weekly payment to $400 and the threats intensified, according to court documents.

Enfanto admitted to investigators that he became angry with J.D. when the doctor refused to pay him, according to court documents. The defendant also admitted that he had threatened to kill J.D.

Enfanto faced up to 20 years in prison and a fine of up to $250,000. Under the prevailing federal sentencing guidelines, he faced between 41 and 51 months in federal prison, Rodway said Friday in an email.

The U.S. attorney’s office recommended a sentence between 24 and 30 months, the defense attorney said. Rodway recommended his client be sentenced to five months or time served.

In his sentencing memorandum, Rodway argued that Enfanto suffered from a serious mental defect due in part to concussions he suffered as a youth athlete. Conditions of Enfanto’s supervised release include mental health counseling, according to court documents.