Overcharges of interest on loan accounts

I contacted Woolworths financial services to inform them they I was overcharged on interest on my loan account. After 3 attempts and the consultant not understanding what my issue was, he eventually put me through to a supervisor by the name of Morne. She agreed that there were indeed discrepancies on my account and that I had in fact been overcharged. She informed me, actually promised me that she would call me back on Monday 13h May after her meeting at around 13:00. Today is Wednesday 15th May and no contact has been made with me. Woolworths de*****s their customers by charging extra interest on loan accounts. It’s small amounts and will go unnoticed if clients do not scrutinise their statements every month. I am disgusted that a company like Woolworths ***** from their customers. I will take this further if I do not hear from them before the end of the week: