Deleted Exchange Calendar item keeps coming back

1. Connect to Office365 with Powershell
2. Disable Callendar Repair Assistant with command:    Set-Mailbox vasya@yourdomain.com -CalendarRepairDisabled $true

The Calendar Repair Assistant performs the following functions:

• Detects inconsistencies
• Determines if inconsistencies were intentional
• Corrects inconsistencies 
• Sends a calendar repair update message if a correction was made

       3. Search and Delete required meeting in calendars:    Get-Mailbox -ResultSize unlimited | Search-Mailbox -SearchQuery 'from:"vasya@yourdomain.com" AND kind:meetings AND SUBJECT:"Type your subject"' -DeleteContent -Force

       4. Just for case if you are looking for another content removal:

–SearchQuery kind:contacts

–SearchQuery kind:notes

–SearchQuery kind:tasks

–SearchQuery kind:im

–SearchQuery kind:email

      5. Enjoy!