Dishonored arrangement

I was called by a standard bank banker/consultant that requested me to setup an arrangement of an unpaid loan amount in April. I agreed on an arrangement with the banker/consultant as to what standard bank will deduct on the 23rd of May and June to settle the amount in arrears. I got the sms confirming the arrangement made between me and banker. But when funds which were not meant for the payment of the loan on the 29 April. Standard bank did as they pleased on my account whilst there was an arrangement that was set for 23rd May and 23rd June. You have made me thee worst disgruntled client ever, the money that you helped yourselves to was meant to pay for an EMERGENCY!!!