I've just received a letter regarding a Parking charge I apparently acquired in the first half of February on holiday in the UK. This was forwarded to me but the car rental agency (Europcar) with an additional 'administrative' fee of 40 pounds. That has to be challenged within 14 days of the date listed. (which due to postal time was 14 days ago today) despite them having my email I'm aware of no other attempt to contact me.
The parking charge itself was for failure to pay and display. The thing was I remember that parking lot. I can guarantee I paid. I can't prove it as the payment was made in cash. Additionally despite what is said in the letter, I never saw a ticket posted on my windshield. The invoice I now have is 100 pounds (At risk of being passed to collections) as the grace period for a reduced fee has now passed as a result of me not being aware that I had been charged a fee. The company making the charge is Northern Parking Services by the way. Just in case anyone is familiar with them.
In this situation what are my rights and what are the potential consequences of refusing payment. Keeping in mind I'm in Australia.