In the event that the accuser fails to produce evidence to support his claim, and there is a finding that his accusations were baseless and were merely for the purpose of annoying or harassing you, then there may be a basis for filing a suit against him for malicious prosecution if a law to that effect exists in the territory you are in.
Right now, it's just an allegation. PR announcing S&M campaign. Campaign never happens. I would suggest there's more evidence regarding fraud than there is about NSS.