This Block Commenter Module will provides a flexible method for Drupal site
administrators to block the list of registered users from commenting
corresponding to selected content types.
Thus it prevents spammers from commenting on the Drupal site.
Watch video demonstration of block commenter
To configure this module,

  1. Navigate to 'admin/config/people/block_commenter'.
  2. Enter a comma-separated list of users which you want to block.
  3. Select the radio button corresponding to what should be done to existing comments by blocked users(Leave as it is, unpublish, delete).
  4. Choose the content type corresponding to which you want to block the user from commenting.

Documentation : http://drupal.org/node/1806418

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