I am opening this topic after your peculiar decision of locking the official achievement gem refund thread.
I was not refunded any gems lost due to your highly controversial decision to change the number of gems awarded for certain achievements. Even after posting in your dedicated thread, it seems like you decided you do not have enough information to refund my gems. This is coming from a company that developed and maintains the game, with full access to the in game data. As a person that is also heavily involved in the software development business, I believe think this is not only very unusual, but highly unprofessional. At worst, a policy set specifically to increase the effort necessary to obtain the missing gems in a ridiculous effort to further monetize the game.
You are placing the burden on me as a player to remember all the achievement and to research the difference of gems between now and before when no such information is officially available. This is wrong on so many levels and a horrific customer experience.
I contacted support via the link provided. There is of course no specific section in the form about this and. I can only pray my submission will find its way to the proper person. Honestly I do not expect a timely response based on the past experience. I am just writing this post to communicate my honest opinion about the way you handled this issue. It was YOUR mistake, not mine to fix and the way you do it is a measure of your company and eventually it will affect your image.