I just got charged for ITunes Match and I want to opt out and get the charge reversed.

I'm not sure you can get a refund for iTunes Match, but if you're in the U.S. you can try calling 1-800-MYAPPLE.

You are able to get a refund through the iTunes Store for itunes match. The iTune Store does not have a direct line as you have to type to them.

This is the link to talk to them. https://expresslane.apple.com/GetproductgroupList.action