Although that article is quite old,
Wilson's no longer seek "liquidated damages" as a specific infringement,
( I can remember lots of activity with new clauses and terms being tapped over their parking signs just after this ruling, )
For everyone's information here are wilson's terms and conditions
"IN THE EVENT THAT:
- You are parked in a parking bay longer than the time stipulated and/or otherwise in breach of the above conditions, you agree you are parking unlawfully and without authority and we may issue a notice requiring you to pay within 21 days $30.00 costs of enforcing the conditions of this carpark."
I'm not sure how enforceable that clause is, but even if it is, in the case of the OP who has been sent a notice for $65, they would need to show where the other $35 comes from. The only place the $35 could come from is the fee for the parking that was not paid. I highly doubt that is $35 and there their notice is invalid and it breaches their own T&Cs.