Debit order incorrect date

I attempted to rectify my debit order with you guys since you always go to my account on the 23rd of each month which I requested on the 24 March that your team leader to get me my recording agreeing to taking this day since I know that I wouldn't choose that as all my debit orders are on the 25th as the vehicle insurance I had was on the 25th. Today again I had a debit and it was return again and this does put my account negative position because I'm charged by the bank for return . Can someone fix this or actually cancel this policy from date of inception , I'll await your response . I also sent Khulu an email who is a client relations consultant and no response