NWU AND VIVIERS INC

I am experiencing bad service from this company that was handed over by NWU to this company which I don't know anything about them they say I owe them 16.000. WHILE THE UNIVERSITY SAYS I OWE THEM 6500 THEY DONT WANT TO REMOVE THE BLOCK ON MY NAME SO THAT I CAN STUDY I'VE EVEN BEGGED THEM FOR AN ARRANGEMENT WHICH THEY REFUSE TO OFFER ME THE 16000 THEY SAY IT'S FOR THEIR EXPENDITURE I STILL SAY I NEVER RECEIVED ANY DOCUMENT FROM THEM PERTAINING THE DEBT THEY ARE TALKING ABOUT. WORST OF ALL THIS IS A STAIL DEBT FROM 2018/19.The university says i owe the 6500 but the copmany called Viviers say I owe them 16.000