cannot change my debit date

<p>i called standard bank to change my debit date for the 16th of august, however they said my first debit needs to run and they will change it to the 16th of september. after my first debit was taken off i called them again and they said there is no way they debit can change they will debit me on the 30th of August and the 16th of september. this is terrible as my account will be overdrawn and i wont have money,,,,,,,please change my next debit to the 16th of september </p>