Firstly, how did you subscribe? Via Google Play or iTunes?
If you're unsure, check how you're being charged on your credit card
If charged to a Credit Card, it will be listed as below
GOOGLE *Telstra CorpGOOGLE.COM = In App subscription via Google Play
APPLE ITUNES STORE SYDNEY = In App Subscription via iTunes
Once you've confirmed how it was subscribed, you can follow the relevant instructions below to unsubscribe
iOS Users with an In-App subscription go to: http://support.apple.com/kb/ht4098
Android Users with an In-App subscription go to: http://support.google.com/googleplay/bin/answer.py?hl=en&answer=2583485
You can find solutions to common issues experienced with the pass via http://www.afl.com.au/livepass/faq