You can always report a member to the moderation service by clicking  'Report profile'  or 'Report photo'  icon found at any photos or on the details user profile.  

Additionally you can report user for inappropriate or violence behavior  in message, written to you from Messaging area.  In you want to report message, click to the flag icon in the right top header of particular conversation.

If the member has indeed breached the site's T&Cs, then the moderation team will take the appropriate measures.

After you reported particular user, he will disappear from your matchlist. conversations or any other lists