Unfairly Billed!

I am so furious at Telkom for debiting my account with an additional R 600.00 which they claim to be for a failed debit order! I refuse to take responsibility of the fee as the payment was requested for prior to my payment date! I've had contracts with Telkom for over two years and received my salary on a Saturday numerous occasions, not once was payment requested for the day before!!!!! I want the fee disputed and the funds returned to my bank account immediately as my pay rule stipulates that if the salary date is scheduled on a Saturday, the payment will be received then. Your contact centre offered me no assistance or solutions, I spoke with Mbali Simelani, what pathetic service. She was so quick to refer me to a branch instead of offering me the required assistance. I want feedback urgently as the funds needs to be returned to my account immediately!