Flamin' parking enforcement services!!

Probably been asked a bazillion times on this sub but is there anyway to get out of parking enforcement? Parked in a Wilson carpark and got stung with a $85 ticket. Thing is I paid the parking on the day but there stupid system parkmate didn't accept payment until 1pm (I arrived at 630am). I didn't receive any breach notice by mail until the "2nd" notice was sent so they say I now owe $105 and are stating I had to dispute within 14 days of 1st breach notice. How can I do that when I didn't know it existed??? What happens if I don't pay it? Would they really send Baycorp? 🤣 and yes I've sent them receipt from the day I question with proof I paid for parking but no response