Debit orders going of to soon

Since September 2014 I have been in a fight with African bank about debit order deduction dates.<br> They keep on deducting money from my account on the wrong dates and it comes back unsuccessful collections.<br> This is unacceptable and reflects badly on my record and bank statements.<br> I am now fed up with them, I have been to the branch in Charlotte Maxeke Street (Maitland street) Bloemfontein, gave them my bank statements and they said they would sort it out.<br> This month (April 2015) they deduct on the 24th April 2015, after I have phoned them numerous times and went into the branch to rectify all their mistakes.<br> How long will I have to keep calling and going on to tell them \I GET MY SALARY ON THE LAST DAY OF THE MONTH!!!"before they stop giving me this dreadful"