although I don't know all of the international rules. dl marketed flight operated by another carrier dl should make the changes to another dl flight on that day. unless the market is not served by delta at all and only served by a delta codeshare partner. delta cannot overbook the same fare on a codeshare partner they can only oversell the same fare on their own flights. otherwise they can waive the reissue charges but they do have to charge difference in fare for a codeshare flight. so I would suggest calling and getting another agent and seeing if they can't reschedule you to a delta flight that is operated by delta. not a codeshare flight
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