"You are not allowed to delete any contacts as you have already exceeded the maximum limit to delete contacts from this org. For further details, please contact our support support@zohocampaigns.com."

I am trying to delete all contacts to start fresh.  Every time I try to delete anything the message above is what is received.  The ones that have been deleted already do not re-sync, so I want to start from scratch. 

Please advise!