ACY mailing and Joomla Client Management review

I recently transferred my site [login to view URL] to a new Hosting service. The guy that set up the site originally is no longer interested in maintaining mine and other sites so I need some help here. This is a Joomla property site using the "Hot Property" Plugin. What did happen was that when a property was reduced or added and client match was carried out using the client management database and a mail was sent to the matching clients taking into consideration Location, Number of rooms Prices etc. This also applied when a new client registered. It now appears that the enquiry form when completed is no longer adding the client to the Client Manager. Please let me have your CV of dealing with similar situations and I will give those more suited access to the backend to investigate and offer a solution.