Apologies! UPark usually enforces with City of Toronto tickets.
The only way to resolve those tickets are to appeal with the City directly here: https://secure.toronto.ca/webapps/parking/index.html and appeals usually take approx. 3-4 months for a response.
For further assistance you can contact UPark directly below:
Website: http://uparkcorp.com/contact/
Telephone: (416) 968-7275
Email: info@uparkcorp.com