No, the customer is not always right

It is right not to give compensation where nothing has been done wrong and the reticketing was done in accordance with its policy for doing so

EK's response seems actually properly addressing the issue raised which is better than I have seen with AA / BA and complaints

You are not lacking in wholeness; you made a change, paid the change fee that gave the ticket that you have. Have you tried asking whether EK will waive the change fee and allow payment of the difference to the higher fare class ; if not is it worth paying the change fee and fare difference to get 1750 miles; if so, then can always do so