If you don't have an employment contract which protected or guaranteed your employment in some way, you probably do *not* have a cause of action for wrongful termination--that's because with a contract, you'd most likely be an employee at will, and employees at will may be fired at any time, for any reason, even incorrect or false ones.However, if the supervisors made factual allegations or statements about you to other people (e.g. HR, other managers or executives, etc.) which are provably false and which damaged your reputation, you may have a cause of action for defamation.It would be worthwhile for you to discuss the situation with an attorney.