If the address is not contained within your wallet then these funds were not sent to this wallet and the address provided was never generated by your wallet.  You have made a mistake in the destination address provided to the other party.  Blockchain.info never has access or control of a user's bitcoins in any way. The end user has 100% control over his or her own bitcoins. This means we have no power to stop, reverse or initiate a transaction on anyone's behalf.