Joomla/EZRealty XML feed problems

I have a property listing website at [login to view URL] built with Joomla 1.5 + listing component EZRealty. I have had XML feed functionality added which works very well. Properties are categorised in to property types (Villa, Bungalow etc.) + all properties are classified into Regions, Departments and Post Code (all properties are in France). Properties are currently categorised into property types manually and regions/departments/post codes are picked up if matching. The feed functionality has the following problems: Regions and Departments (Departments are sub-categories of Regions) seem to be duplicating from incoming feed URL's - some are incorrect spellings and some are not and some misspelt Departments are being added to duplicate Regions, and vice versa - it's a mess + my search box drop-downs show these duplications. I want the feed function to add 'property type' categories if they are an exact match. Please do not send me marketing emails Thanks Nick Garnett