debit order change

In January I was switching my bank accounts from savings to cheque. On the 28th January I filled a document with my bank to change everything my salary and debit orders to run on a cheque account, which my bank did sent request to everyone. End of Feb you guys debited savings account with 9111 number and it bounced, I took the initiative to call your call center to rectify things it was on March the agent confirmed that end of march I will be debited twice which I did not have a problem. The day comes for the debit again it was ran on a savings account and a cheque here are my notify me massages one for a debit order that bounced one for the debit order that went thru \ Absa: CHEQ8988, Sch t, 29/03/16 SETTLEMENT/C - ACB DEBIT:EXTERNAL, 0634 DEBIT-CC/FIN/33166, R-69.00, Available R1,097.07. Help ***