A Microsoft file hosting and synchronization service.
Hello,
If your Microsoft account was hacked and your OneDrive data was deleted, please start by changing your Microsoft account password and enabling two‑step verification.
After changing the password, open the OneDrive website and check whether you can restore your files from the Recycle Bin.
If restoration is not possible, I recommend contacting Microsoft Support and also consulting the police.
Please refer to the support article below. The article also includes a link to contact Microsoft Support.
How OneDrive safeguards your data in the cloud
Restore deleted files or folders in OneDrive