Account Handed Over

I opened an account with Vodacom on 26/03/2012. This was a pre-paid sim that they converted to a top up package. I got my credit report today saying that I owe the company R728. I have sent numerous emails to customer care to arrange payment, with no response. Now I am being harassed by a lady called Caroline who send me a email with the banking details. She said that she made arrangements for a discounted payment of R1300 ??? this amount does not make sense. Her email states that the banking details for Vodacom is Acc number : ***<br> Branch Code : 190242<br> Reference : I***<br> Benificiary: Jacobs Burnard <br> I also spoke to Rosemary from the call centre who advised me to call the legal department, I will do so on Monday morning.(***)<br> Please assist me with this matter as I am being harassed for more than I owe. They are contacting my family members and confirming my personal details with god knows who.