So you have four name changes - twice at 42 euro each making that 336 euro and you want 950, then there is the extra to pay as the flights will have changed. Not worth it. I have two tickets from Gatwick to Paphos for end of August - tried to change them as step daughter is pregnant and due 5 days after the return journey and the cheapskates won't give a refund - cost was twice what I paid for the original tickets, so I am dumping them as bought tickets elsewhere at only 187 euro each.
Sorry to be a bearer of bad news but that is the way it is and I think unsuspecting people should be aware of it.
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