Final Pay for terminated employees

We had reasonable suspicion that one of our employees was under the influence of drugs. The immediate Supervisor and Manager wrote their statements. The employee was asked to go take a random drug test- he refused and instead said he QUIT. This is cause for termination (refusing to take the drug test)- can we write all the paperwork and say that he was terminated and not resigning?
Also, he received his final pay- he was told by or HR manager he would receive his pro-rated vacation pay. She is new so she didn't know our company pays anniversary pay .. we don't pay any pro-rated pay for this. Now are we suppose to pay this to the terminated employee because it was promised by the HR manager??
Also, he received his final pay- he was told by or HR manager he would receive his pro-rated vacation pay. She is new so she didn't know our company pays anniversary pay .. we don't pay any pro-rated pay for this. Now are we suppose to pay this to the terminated employee because it was promised by the HR manager??
Comments