My son accidentally purchased an in-app purchase of Temple Run Oz. How do I get that removed?

You can try contacting iTunes support via this page : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption

To try and stop it happening again you can turn off in-app purchases on your phone via Settings > General > Restrictions > In-App Purchases 'off', and depending upon what version of iOS that you have on it you may also have a Require Password setting on the Restrictions screen which you can set to 'Immediately'

Did they help you. My son just charged 100 to my credit card