Reversed Debit Order and Charged Per Debit Order

I Have Contacted the Call Centre Yesterday and Today. yesterday I was told a query has been logged and ill be receiving an sms, I never received it and I decided to call again today I spoke Silvia Setle (F ********** ) she just didn't help but gave me attitude as I explained my situation. My Debit orders run on the 25th of each month i transferred the money in my account before 24 hours and received the Smses to say debit orders went through and the money was deducted in my account. now Monday morning i received Smses to say the debit orders bounced and i was charged R100 per Debit order which i fail to understand how you changed me as when i transferred the money i was on a minus of R1400 and couple of cents and i transferred R1500 to cover the debit Orders but i was charged the money over the weekend minutes after the Debit Orders bounced not even 24 hours or wait for Monday. now I'm sitting with no solution to my Debit Orders. I Need This to be resolved please.