I have deleted History I no longer used but the Account storage usage quota doesn’t change.
I was not able to free up disk space using Storage dashboard. Refresh doesn’t work, Free up disk space can’t find any deleted datasets to permanently delete.
Is there anything I can I do about this other that deleting my account?
Hi @droslj
Would you please check under User → Archived Histories? Are any listed? If so, those are counting toward quota and is probably not what you wanted to do.
When you “Archive” a history, that protects it from accidental changes. Could be shared in a publication or something similar. You can move it back into your User → Histories list to do more with it.
If this isn’t enough, please write back and confirm the server is EU. You could share back a screenshot of the User → Histories. Be sure to expand the Advanced Search and set status = all and capture that in the picture. Or, you might notice where your data is in that view. 
Related: How can I reduce quota usage while still retaining prior work (data, tools, methods)?