Ms Flack received a reminder for an unpaid payment notice on January 7 which said she was required to pay $88 to Australian National Car Parks for a parking infringement.

Ms Flack said she was planning to pay the fine until she noted the location of the alleged offence.

The letter, which included Ms Flack's full name, infringement number and car registration details, said she must pay a fine of $88 within 14 days of when the letter was sent.

Ms Flack said she thought the letter was legitimate, but was confused with the Barkly Square Shopping Centre car park location where she supposedly received the fine in June last year.

Barkly Square is in Brunswick, Melbourne.

"I don't even know where it is. I've never been there before," she said.

"I knew there was a Barkly Street in Ararat, so I called the Ararat council to find out whether I had any outstanding fines."

Ms Flack said she rang the number on the letter and asked why it had taken so long to receive a letter from a fine six months ago.

"The woman told me it took six months to process the letters," she said. "I asked her where Barkly Square was as well and she just told me she didn't know."

Suspicious that the fine was a fake, Ms Flack checked her date book for the infringement date.

"I realised I had been at a garden party in Horsham that day," she said.

"It was a meeting so I even signed a log book to say I was there."

Last week television program A Current Affair reported that people had received fines from car parks they had never visited. Following the first story which aired on Wednesday night, the station received hundreds of letters from people who were in the same predicament.

On Thursday night the program announced the Australian Competition and Consumer Commission would investigate the fines.

Ms Flack said she had written a letter to Australian National Car Parks explaining her case and said she would not be paying the fine.

"I want other people to know in case they get the same thing," she said. "Check fines carefully and if they're wrong, don't pay them."

Australian National Car Parks refused to comment on how the mistake was made.

A spokeswoman said customers who wanted to contest a fine had to send a complaint in writing to the head office in Sydney.

"The best way we can help is if they send a letter and include a copy of the payment notice," she said.