The problem with Oneworld award tickets is that the "fare" has to be allocated and sent to the various airlines doing the flying on your ticket ... this process occurs when you redeem the miles, hence the restriction against switching airlines or routings which change the payment allocation to the other airlines. AA and the other OW airlines do disclose this fact before you redeem, though the significance may not sink in. You can cancel, redeposit the miles and reissue the ticket in entirety, but this is inefficient and high risk (chances are you won't get all the sectors again). There is no escalation possible to fix your problem, as the mechanism to reproportion your "fare" just does not exist.