Billing

Can someone help me understand the reason for being charged.

I have a contract with Telkom for almost two years. I get paid on the 25 irrespective of whether this day falls on a weekend or during the week. I had requested that I be debited on my salary date.

Now in August, my salary date fell on Saturday but Telkom deducted on the day before (24), how when I haven't gotten paid yet? I get an sms threatening that I'll be listed negatively. I have never missed a payment since I had this account. I had queried this but no one got back to me.. The funds were then deducted the Monday (27/ 08).

Now I get a statement saying that I'll be billed R584 due to missed payment. I called for clarity, the lady I spoke with informed that I'll only be billed R393 including R202 which is for late payment. How was I late when you debited on the wrong date? How is this my fault when I had specifically asked for the 25fth as my deduction date? Why not communicate prior and suggest that I make payments myself then?

I will not be paying for the extra charge.