Q: How do cancel iTunes Match?

Hello, maiatrindade.

Thank you for visiting Apple Support Communities. 

Here are the steps on how to cancel iTunes Match. 

To turn off Auto-Renew for iTunes Match

iTunes Match will automatically renew your subscription at the end of your 1 year subscription by default. To turn off Auto-Renew:

1. Open the latest version of iTunes.
2. Choose Store > Sign In.
3. Enter your Apple ID and password, and click Sign In.
4. Choose Store > View My Account. You may be asked to re-enter your Apple ID password.
5. In the "iTunes in the Cloud" section, click Turn Off Auto-Renew to the right of iTunes Match.

Note: If at any time during the matching and uploading process you lose your Internet connection or experience a power outage, iTunes will automatically resume where it left off the next time you open iTunes.

iTunes Store: Subscribing to iTunes Match

http://support.apple.com/kb/HT4914

Cheers,

Jason H.