*****ulent and unauthorized debit

I had a contract with Vodacom which I struggled to have it closed as they were trying to convince me to upgrade which I refused on recorded line. Fortunately they stopped it after I wrote to you, it was sometimes around July. All of a sudden in April they debited me R100 on my source acc. I have not even accepted a debit or debicheck . Now I'm receiving harassing calls and messages from their external collectors because I reversed that amount. My contract with them was not even R100. If no reduction I will escalate to Icasa