An angry shopper has vented their frustration at someone's double-park at a busy shopping centre on Wednesday, piling trolleys against the car's door and leaving a note calling the driver an "asshole".

The problem is, the vehicle was being used by a disabled shopper who had parked across the two standard bays - as all the ACROD parking spots were in use.

The vandalised ACROD stickered car at Garden City on Wednesday.

Witness, Alex, said she had driven to Garden City shopping centre in Booragoon with a friend on Wednesday, when she noticed the vandalised car and alerted centre management to remove the trolleys.

"I was just disgusted by it," she said.