You appear to have an action for defamation
and tortious interference with contract against the employees. You also appear to have an action based upon breach of contract
with your employer.
It appear that you may file an action against the employees personally for the torts of interference with contract based on a business expectancy and defamation. This is independent of your action against the employer.
To establish a prima facie claim for tortious interference with contract, you must show the existence of a valid contractual relationship or business expectancy; the interferer's knowledge of the relationship or expectancy; intentional interference inducing or causing a breach or termination of the relationship or expectancy; and resultant damage to the party whose relationship or expectancy has been disrupted.
Defamation basically consists of: (1) a false statement of fact about another; (2) an unprivileged publication of that statement to a third party; (3) some degree of fault, depending on the type of case; and (4) some harm or damage.
Libel is defamation by the printed word and slander is defamation by the spoken word.
Based upon your post only, you appear to meet all the criteria to establish a prima facie claim for tortious interference with contract and defamation.
You can file a breach of contract action against your employer. Your employer requested that you perform a QIC. You performed the QIC to their specifications. As a result of the performance of the QIC you were denied compensation.
You will want to meet with a local lawyer at your earliest convenience.
I hope that the information which I provided was helpful to you.