No service from call centre or in the bank

I went into the branch to get a debit order cancelled that I had set up to go off my account. The consultant said that there was no debit order to cancel. This morning the debit order went off. I called the call centre, on her side she could see there was a debit order still. I asked if she could assist me with reversing the debit order then she put my through to the investments call centre. I then asked the lady to assist me with the reversal and she said that it doesnt help I do it today because everything that gets processed on a Sunday doesnt stay on the system. I need to pay my accounts and now there isn't sufficient funds in my account.