CALLING ME AT WORK AND THREATENS ME

GIVEN FIRST CALLED MY HR TO ASK TO GARNISHEE MY SALARY BUR THEN THEY SAID THERE ARE NO COURT ORDER..THEN HE CALLS ME TO TELL ME HE WILL TAKE MY PAY I ASKED WHY?? I WAS NOT IN COURT ..TO MY SURPRISE IT IS FOR UNIBANK WHICH DONT EVEN EXIST ANYMORE AND I WAS UNDER ADMIN A FEW YEARS AGO ..ALSO MY DEBT WAS WRITTEN OFF IN 2006...THE AMOUNT ARE BEYOND HUGE AND THEY WANT TO FORCE ME TO PAY ...HE THREATEN ME TELLING ME AGAIN HE WILL TAKE MY PAY ..NOW I MUST LIVE IN FEAR LOSING MY JOB ON SOMETHING I DONT OWE...WHAT DO I HAVE TO DO ???I BELIEVE THOSE ATTORNEYS TOOK OVER THE CONTRACTS AND NOW THEY LIVE OFF POEPLE SALARIES MAKE THEM PAY FOR THINGS THAT WAS WRITTEN OFF YEARS AGO ...