How do we get the condo association board to follow our bylaws?

I live in a 766 unit complex. I recently found out the condo association board is not following the by-laws for the voting process. I challenged the condo board and was told that it's up to their discretion how to conduct the election. It is not done at the annual meeting as stated in our by-laws it is done by mail through an accounting firm with the information on eligible voters being furnished by the Property Manager. Short of filing a civil suit, any suggestions?