Are you saying that you followed all the links and instructions in the previous posts and the U2 songs are still on your iPhone? If so, there's likely something wrong with your iPhone because those songs are delectable from your iPhone just like any other songs on your iPhone. The link you were provided was to remove the songs from your purchase history. Have you considered making a Genius Bar appointment to have your iPhone checked out? They can also help you get those songs deleted once and for all.
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