A father says a Manhattan hotel didn’t take him seriously when he told them his daughter was trying to commit suicide in one of their rooms, according to his new lawsuit.

David Johnson says on May 26 his daughter, Deborah Johnson, called him from the Lexington Hotel saying, “Dad, I love you…I left a note,” according to his Manhattan Supreme Court lawsuit filed Tuesday.

David eventually got into the room where his daughter lay blue with a plastic bag taped around her head. Thankfully, cops were able to revive her, but not before hotel staff dragged their feet for over 30 minutes, according to the court papers.

When David first got the disturbing call while at Central Park’s Loeb Boathouse, it took him 11 tries to dial through to someone in the hotel, whom he told to check on Debbie’s room, the lawsuit says.

David called 911 and arrived moments before cops did.

“Did you get to my daughter? Did you open Debbie Johnson’s hotel room door?” he asked a front desk employee, according to court papers.

The worker responded, “Sir, I’m waiting on someone. You’ll have to wait your turn,” court documents allege.

“The Hotel Employee’s cruel words struck David to his core,” prompting him to scream in the lobby that someone let him into her room “now!!!” the suit describes.

And the employee’s brush off, “unreasonably endangered David’s own physical safety,” who, “felt like he could have a heart attack at any moment,” the court papers say.

When police finally arrived, a staffer accompanied them up to the room and tried using a hanger, not a key, to try to get into her room, the court papers claim.

This too sent David reeling. ““All you have is coat hanger? Get a key!”” the dad yelled, according to the suit.

The whole ordeal, from when David arrived to when they opened the room, took 30 minutes, the court filings charge.

When the door opened, an officer said, “Oh my god” while they held back David.

“Debbie’s body was lifeless and her legs were turning blue. She had tape over her mouth underneath a plastic bag that was secured tightly around her head,” the lawsuit says.

Luckily, “Debbie had applied the plastic bag over her head well after David first asked the Hotel Employee to let him into her room,” the court papers say.

“David brings this action to be compensated for the emotional distress damages that he was forced to endure as a result of the Hotel’s atrocious and utterly intolerable handling of the incident,” the lawsuit charges.

The father’s lawyer, Richard Roth, told The Post that the hotel’s “conduct is utterly outrageous. No parent should have to go through what Mr. Johnson had to endure.”

A manager reached at the hotel declined to comment.