One more thing, ultimately EK may still be communicating with the TA, so perhaps you can try some industry body for TAs or find another TA (bricks and mortar) and meet them in person, explain the issue, and ask if there's a way they can step in and take over those reservations (though they're in the past), you might have to offer to pay a nominal fee. No idea if this is in any way possible, but they may have a more direct way of contacting EK perhaps.