cancelled re-occurring calls

Hi 
Can anyone help me, I recently cancelled two re-occurring client calls via outlook, which were successfully cancelled and removed from calendars within my organisation, however these two meetings are still showing in my clients calendar as being active and causing confusion. these were cancelled over a week ago so I have no way of even seeing them to cancel them again - The client has sent me the zoom links so I have them, but no way to cancel them. Can anyone advise if this is even possible or if I will just have to ask the client to delete the links directly within there own calendars.
Thanks for any help or advise.