A crew of subway riders who say they’ve been overcharged and issued phantom fines on their MTA-issued OMNY cards want the state’s top prosecutor to investigate the alleged debacle, The Post has learned.

The group Passengers United told The Post they are organizing rallies outside Attorney General Letitia James’ office to push for a probe into the tap-and-go fare system they claim hit hundreds of New Yorkers with overcharges and improper fees.

“We want them to investigate [system developer] Cubic for defects with OMNY, including overcharges, [and that] it doesn’t show payments leading to erroneous fines from fare inspectors,” group president Charlton D’Souza told The Post.

Passengers United members say they’ve been overcharged and given phantom fines on their MTA-issued OMNY cards and want AG James to investigate. Steven Hirsch for NY Post In addition to James, the group sent letters to city and state lawmakers laying out the complaints, along with a petition demanding the MTA fix OMNY and restore unlimited passes. Gregory P. Mango for NY Post

Cubic did not respond to a request for comment.

The group also has fired off letters to the AG, city and state lawmakers laying out the complaints, along with a petition demanding the Metropolitan Transportation Authority fix OMNY and restore unlimited passes.

Prepaid seven-day and 30-day passes were scrapped in lieu of an automatic cap system that caps a straphanger’s tab at $35 over seven days. After that, the rest of the week’s rides are supposed to be included.

Some bus riders have complained of being charged for rides they didn’t board after tapping cards with insufficient funds.

Fares hit a record high of $3 this January and the MTA is considering 4% increases for both 2027 and 2029,  which would roughly be an additional 12 cents per swipe.

“New Yorkers are fed up. We’re at our breaking point,” D’Souza said.

MTA head honcho Janno Lieber was pressed on the allegations at the agency’s July 29 board meeting, pledging to fix the issue even while downplaying social media complaints.

“If anybody has an issue where they feel like they’ve been unfairly charged at the turnstile or, God forbid, handed a ticket unfairly, we want to know about it, and we will fix it,” Lieber said.

The MTA and the AG’s office did not immediately respond to requests for comment.