Unauthorised Debit Orders

I am extremely disappointed with FNB, my debit order was suppose to go off on the last day of the month which was a Sunday therefore the debit order is scheduled for the next working day. Monday my account wasn’t debited cause I had funds until the 2nd of March and I only realized on the 3rd of March when I opened my app to see a charge of R110 for an unpaid debit order, I was upset about it but accepted that this happened. But then on the 5th of March an attempt to debit my account happened and a charge of R150 was incurred then again an attempt to debit my account on the 10th of March which resulted in another charge of R110!!!! I’m willing to pay for the first charge however the other charges should not have been incurred as the agreement is if the debit order returns they will double debit at month end.... can someone please assist with reversing all these charges on my account?