On her way to meet friends for brunch on a recent Sunday morning, Anna Kealey didn't think twice about cancelling her Uber service three minutes after she'd requested a ride on her smartphone.

The 28-year-old Londoner was feeling anxious at the time, she told The Washington Post, and decided to walk to calm her nerves.

On her lunch break Wednesday -- 10 days after her canceled trip -- Kealey noticed an old voice mail on her phone. She pressed play and was shocked by what she heard.

On the recording, a man’s voice repeatedly says, “Hello, please don’t do that again.” He grows increasingly incensed and says “you bring me here and you cancel,” before referring to Kealey as an "idiot" and adding, “Do that again, and I’ll cut your neck.”

For a moment Kealey thought the robotic-sounding rant was a prank, until she remembered her canceled ride more than a week earlier.

"I heard the part about cutting my throat, and I think I almost fell over in the cafe," she said. "I felt weak and was almost dizzy. Even though it's not a direct threat, it felt so creepy, and I realized this person had been driving around for the past 10 days."

After filling out a complaint form on Uber's Web site, Kealey turned to Twitter.

Since she had the driver's phone number, Kealey suspected the company would have no trouble identifying him, whom she'd never met. She said that she also filed a report with London police.

"I wish I'd heard it within an hour of him leaving the message," she told The Post. "Then, I would have immediately reported it."

Kealey said the anger she felt toward the company dissipated when they took her complaint seriously minutes after she tweeted about it.

"The woman I spoke to was very empathetic," she noted.

According to Buzzfeed, Uber has released a statement about Kealey’s experience.

“We have spoken to the rider to ensure they are OK and encouraged them to report this the police," the statement says. "The driver has been immediately suspended, as is our policy, and we are investigating fully.”

Cab drivers and strangers have been sending messages to Kealey telling her to sue Uber, but she said punishing the company was never her intention. Instead, she said, she just wants to remind commuters -- particularly women -- to remain aware of their safety, even when they're relying on a cab service.

Has she given up on Uber?

"No," she told The Post. "I'll probably use it again, but probably not before I give it some time."

Kealey is still struggling to understand what drove the Uber driver to leave her such an aggressive voice mail considering he received a cancellation fee. She wondered if the mystery driver is violent or "mentally unstable."

"When I think back, I'm glad that I I felt so on edge that I decided to walk," she told The Post. "It ended up being my saving grace because I almost ended up in a car  with someone who was aggressive and threatening."