Mass deletion of all data in Zoho CRM

Mass deletion of all data in Zoho CRM

I need to delete all of the data in my leads, potentials, accounts and contacts but I can only find a way to delete them 100 at a time. Is there something you can do at your end to mass delete all of the data so I can re-upload the data I need? In the middle of a big telesales campaign so a speedy response would be much appreciated.

Thanks,

Gina