Q: i have been billed over $100 for a 1.99 game purchase....who do i contact

You didn't make any in-app purchases within the game e.g. to unlock extra features, levels etc ? If not then you can contact 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