Unable to delete files following a reduction in OneDrive space

Hello everyone, I’m explaining my problem: I work as a teacher in a public school and our Ministry of National Education has partnered with Microsoft to provide a Microsoft school account for each teacher, an account that entitles you to an Office Pro license and a 2TB OneDrive space. I took advantage of this space to save my professional and personal files which took up almost half of this space, 1TB.

Last week and for an unknown reason, the OneDrive space was reduced to 100GB instead of 2TB so I found myself with a OneDrive space saturated at 1090% and so I no longer have the possibility to delete, add or modify files! When I try to delete a file the following message appears on the screen “this site has exceeded the maximum storage limit for files to free up space delete unnecessary files and empty the trash” the problem is that the trash is empty and I can no longer delete files because of this message that appears on the screen! And on my computer when I delete a file in the OneDrive folder it immediately re-downloads so I can neither delete files directly on the OneDrive site nor delete them from the OneDrive folder on my computer! I have dissociated OneDrive from my computer and I have completely uninstalled OneDrive and despite all this I cannot delete files on the OneDrive site and the trash is still empty! The IT manager in my school doesn’t understand anything and doesn’t know what to do. Can you help me please?