Right to Contest the Validity of the Claim

In response to the parking citation I received via USPS that had a $5 late fee added to the balance due because I didn't respond to the first citation within the required 21 days:

-1st This is a mistake.
-2nd I did not receive a previous notice.
-3rd I was not at this location on this date or any date close to it. My work calendar is attached for that particular day to prove that I was in a meeting from 1:15pm - 2:00pm.
-4th No one borrowed my car.
-5th Someone must have written the plate number down wrong.
-6th This is obviously a college student.
-7th I work M-F from 8:00am - 4:30pm and don't have time to fix other people's mistakes.
-8th Please figure out what needs to be done because I am not paying for a parking violation that I did not commit.

Thanks,
Paula Anderson