If you did not have the foresight to develop your application so that you can begin to refuse advertising, it is unlikely that you can do much to disable advertising in versions of the application that currently exists. The best you can do is remove any instances of ADBannerView from your application, rebuild and release the update.
I never tried to disable iAds, and the fact that this question went unanswered until it suggests that this is an unusual situation. You can call Apple Developer Services at 1-800-633-2152 (in the United States) to find out if you can cancel your agreement or take other actions that will cause Apple to stop showing your ads.
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