Joomla Bulk SMS, Mambotastic issue

Hello, We need help with either getting Mambotastic SMS to work with the clicktell account we have set up. We have configured the account however SMS does not send, please fix this. If Mambotastic cannot be made to work I need an alternative script for Joomla so that we can from Joomla admin send bulk smsm to the users. Please highlight all of the sites you have with SMS bulk send from Joomla.