how do I disable 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 for iTunes Match from a computer

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.

To turn off Auto-Renew for iTunes Match from an iOS device using iOS 7.1 or later

1. Choose Settings > iTunes & App Stores.
2. If you're not already signed in with your Apple ID, tap the Apple ID field, enter your username and password, and tap Done on the onscreen keyboard.
3. Tap your Apple ID name and choose View Apple ID.
4. From the Account Settings page, scroll down to the iTunes in the Cloud section, and tap the Toggle so that it slides to the left.