PORTLAND — The Windham escort service owner accused of trying to extort from a longtime client pleaded not guilty in the case Friday.

Nicholas Enfanto, of Saugus, Mass, entered the not guilty plea during his arraignment in federal court on a charge of sending interstate communications with intent to extort.

Enfanto, the owner of Enfanto’s Perfect Pleasure Escort Service, accused a client of contacting escorts directly and therefore owing him more than $100,000 for lost business, according to an FBI affidavit.

Enfanto threatened to shoot the client, identified as “J.D.”, if he did not pay, according to the document.

The client agreed to pay $250 a week, but Enfanto increased the amount to $400, the affidavit stated. J.D. reported the situation to Falmouth police when the threats escalated, according to the document.