After 6 years Telkom says I owe them

I saw an amount of R735 on my credit report they say I took something out in 2014, all these years I been paying my debts and it was nowhere to be found. Now six years later they captured it on my Itc. What sort of nonsense is this, are businesses trying to boost their sales and figures during Covid 19. I mean why all these years I wasn’t aware of this until 2021, which sort of nonsense is this one. I need that thing off my credit report don’t be trying to use our names because business are not doing so well. I need answers