AUSTIN (KXAN) — Many Austinites are reporting seeing large charges from the Park ATX app, which many use to pay for parking in the city. The Austin Transportation Department says they aren’t being overcharged or mis-charged.

Instead, ATD says some users who added money to their digital wallets between July 24 and Sept. 6 weren’t charged at that time. The Park ATX vendor, Passport, Inc., said it recently discovered the delayed transactions and began charging users over the past 24 hours.

Passport, Inc. said some people weren’t originally charged because of a system change with the Park ATX app. It said the issue has affected less than 20% of users.

“Users may see multiple charges appear on their statements,” Passport, Inc. said in a statement. “Rest assured, we’ve verified that these are all authorized charges reflecting each individual wallet load transaction during the affected time.”

KXAN has received several reports from viewers sharing their own unexpected withdrawals from their bank account from the vendor responsible for the Park ATX app.

Michael Keller, who lives in Austin and has worked downtown for a year, said ten dollars was withdrawn from his bank account every 15 minutes, 35 times, resulting in a total transaction of $350.

“I locked the card and I kept getting hit,” Keller said. “Finally at about noon, it stopped.”

Another, Mike Rico, who works construction downtown, said he and his colleagues are all noticing these transactions to their accounts.

“One guy got charged ten dollars, eleven times. Another guy got charged 14 times,” Rico said.

“It adds up to 140, 150 bucks, so yeah, it’s a struggle,” said Craig Williams, an electrician who is currently working in a newly-constructed building downtown.

“Somebody from Park ATX is going to hear it from me until they can be removed or I’m going to dispute them,” said Kelly Goldsteen, a bartender on 6th Street.

An email, sent by donotreply@gopassport.com to a Park ATX user, shows an advance notification describing the financing mistake.

“Between the dates of 7/24/19 – 9/6/19 an issue occurred within the Park ATX App that prevented some users’ credit or debit cards from being charged when adding funds to their wallet accounts,” the e-mail reads. “With the issue corrected, we now need to charge your card for the funds that were added to your account during this period but not actually charged at the time and will do so in the coming days. You will receive an updated receipt via email for the charge that was missed.” The email is signed, “The Passport Team.”

“I am going to fight this with my bank’s help and they are going to have to prove to me that I do indeed owe them this money,” Keller said.

Passport, Inc. says anyone who needs help can email them at contactsupport@passportinc.com or call 704-817-2500.

Passport has worked with the city of Austin since 2016, according to its website. It created the ParkATX app for the city, which launched in February this year.

On Monday, the city of Austin increased its hourly parking charge from $1.20 downtown and $1 elsewhere to $2. The city says it’s an effort to free up more spots.

Tonight on KXAN news at 9 and 10 p.m., Alex Caprariello will speak to those who have been surprised by this unexpected expense to find out how they plan to fight the charges.