If Railway determines that Referrer or Referee is attempting to obtain unfair advantage or otherwise violate the terms or spirit of such special offer, Railway reserves the right to (a) revoke any rewards or incentives issued to either Referrer or Referee and/or (b) charge the Referrer or Referee for any rewards or incentives (1) used by Referrer or Referee prior to such revocation or (2) issued by Railway to any ineligible Referrer or Referee.