Google Calendar Sync

Google Calendar Sync

We are a law firm and we use the "Cases" tab to organize our cases.  Within that tab, we add Activities to the calendar.  When I add a new activity, everything syncs to the zoho calendar and then to the google calendar that it synced to it.  However, if I edit the date of an event, it won't move it on my google calendar.  

I spent a long time on the phone with zoho, and they eventually couldn't figure it out and told me to contact google because there was an error in google's back end.  I have no idea what I'm supposed to do with google.

Has anyone had this problem?  And anyone figured a work around?  

Also, the customer service stinks.