Harrassment with wrong facts...no overdue account

I am being contacted by phone and SMS's stating that my Vodacom account is overdue and that I have been handed over for debt collection. The amount quoted on https://nbagrp.co/PraQVQZ with ref is APV19115 and I am contacted from ********** 7. My Vodacom number under discussion is ********** 347. The link shows that the outstanding amount is R795.06. My debit order is up to date and went off on 04/11 according to Vodacom invoice. Currently the balance is R320.71 due at end Dec. Pls stop harrassing me and get your facts in order.