We have an issue where we have exceeded the number of allotted roles. In my investigation I found that 3 roles get created when a contact gets enabled as a Customer Portal User on an account that doesn't have the Executive, Manager & User roles. I believe that these 3 roles get automatically generated by based on what is set up as in Setup|Customize|Customer Portal|Settings|Number of Roles per Customer Portal Account. 

We have a bunch of users that have never logged in that belong to many accounts. If we diable them, how can we delete the unwanted Customer Portal roles? Because these are system roles, They can not be accessed via Setup|Manage Users|Roles.

Thank you very much!