Payment rejection fee charged on my account and it's Telkom's fault to debit my account on the wrong date

My account was incorrectly debited on the 24th August and I had insufficient funds. My contract with Telkom is to debit my account on the 25th of each month. Now the recent invoice they charged me R202.70 for "Payment rejection fee" when it's their fault to debit my account on the wrong date.