Victorian detectives are appealing for witnesses to the bashing of a 64-year-old deaf Uber driver in Melbourne's south-east just over a week ago.

Wallan grandfather Ron Chapman was driving down Frankston-Dandenong Road when he noticed another vehicle driving erratically in front of him.

Police say that car was a black Holden Captiva, which was stolen earlier last month.

After Mr Chapman flashed his lights at the car, it moved behind him and rammed his car hard before speeding off.

Mr Chapman followed the car to a street in Frankston North, where he began to take down the number plate details in his service manual, which included his Uber business records.

Ron Chapman says he's been traumatised by the violent attack.. ( ABC News )

After one of the men opened the driver's door and snatched the book from him, Mr Chapman got out of his car and asked them to return the book, explaining he was deaf.

He said he was then knocked to the ground by two men who walked up behind him, before being held on the ground while all three men punched and kicked him.

"It was the first time in my life I'd ever been assaulted or been in a fight, so it was very traumatic for me, and very scary," Mr Chapman said.

Police are keen to speak to a man and woman nearby who came to his aid, causing the three men to flee.

The attack took place about 9.30pm on Sunday, April 29.

Police said this car, which was involved in an earlier theft, may be the same vehicle involved in the assault. ( Supplied: Victoria Police )

Police seek witnesses, dashcam footage

Mr Chapman suffered cuts to his head and drove to the Frankston Police Station before being taken to hospital.

Detective Senior Constable Nick Jung said the attack occurred somewhere near Lobator St, Alba St or Monterey Boulevard, but Mr Chapman was unable to remember the exact location due to the trauma of the attack.

"It's a disgusting act that's obviously happened in a neighbourhood … a pretty low act," Detective Senior Constable Jung said.

"We're very lucky that Ron only sustained the injuries that he did.

"The man and woman who intervened obviously saved Ron from further assaults."

Police have released an image of a woman seen with the stolen car at a petrol station before the bashing.

They also released a dashcam picture of a black car involved in a theft which may be the same one as was involved in the assault.

Police are asking anyone with information to contact Crime Stoppers on 1800 333 000.