So anyone else having this problem, has Customer Support emailed you back yet? I am interested in seeing what the Customer Support responses are and see if there is something strange going on with sudden loss of SG - probably some sort of confirmation error.
I just received a response from Customer Support that said I had spent 700 SG on a Collection Folder, of all things. The thing is, I have no recollection of doing this, and I have read every dialogue box meticulously. I went ahead and looked at the Collections Folders and I had 6 slots, where I previously only remember having 5. I also tested buying a Collection Folder, and it takes two confirmations to even purchase one.
The thing is, I just found someone else who had their Star Gems suddenly disappear and Customer Support had just recently contacted them. They were told that they also bought a Collection Folder. We have both sent emails back that this is not the case and neither of us have any recollection of ever purchasing a Collection Folder. Could it be some sort of confirmation error in the UI for the Collection Expansion?