Got another e-mail from AY, they said that they checked with OW and all of the exMPM xONEx prices should have changed on 1 Aug 2016. I guess fares department of member airlines were just slow to change the fares after the decision.

Can they really claim that those AY exMPM historical fares existed on 06 Aug 2016 are error fares and not to reprice with those published fares? If they can, basically I have no possibility to make any reroute to the ticket without paying the high fare difference between old and new exMPM fares, right? Or maybe try with JJ/LA/MH/S7/UL? At least LA is impossible to deal with, tried that before AY.