Card Settlement

I have been a loyal customer at woolies for the past 8 years, but the terrible service received these past few weeks very disappointing. I had settled my Store card via ABSA, but because the reference quoted was incorrect I know have to pay R120 which I am getting harassed every day with many calls on my cell and at work. R120?? It's as though I'm owing thousands of Rands please Woolworths!!!