Managing personal Outlook.com account settings, security, and privacy
In reply to mshaker1, it is some weeks since in desperation I turned to OneDrive support as the accounts team was silent, so I can't remember exactly what I did, but you could try:
https://support.office.com/en-gb/home/contact?ContactUsExperienceEntryPointAssetId=S.HP.onedrive
I had to create a another Microsoft account, of course, to do all this.