How to update or sync Calendar in real time

I am switching software from Lodgify to Ownerrez.  I imported my calendars from Lodgify to Ownerrez.  There seemed to be a glitch and dates got blocked on the Ownerrez side that was not blocked on Lodgify.  The Ownerrez calendars shows those blocks were coming from Lodgify.  I deleted all imported calendars to try and fix it but even though all calendars are deleted the bookings and blocked dates are still showing on my Ownerrez calendar and I cannot delete them.  Is there a workaround for this?