Listed on ITC but owe Vodacom R0 since 2018

I had a default listed from Vodacom a few years ago, I paid it up and requested that they clear my name. Two years later the default is still on clear score. This affects my credit record and when you try get hold of them yo will spend half the day holding on. This is really disappointing, if I recall two years ago I spent a week trying to get this cleared.