Absa Vehicle Finance Can't take NO for an Answer !!!!!!

This goes to ABSA Vehicle Finance , Keeps on sending me SMS's saying they are going to move my debit order for December , the more I reply NO , the more I get another 1 , what don't they understand as far as I know we have an agreement for the 28th of each month . I have never skipped a payment , but yet they persist on keep on sending an SMS's , so please get into your heads , No is No , I don't care if nobody else can pay you , I can and want to pay you on the date agreed upon , If nobody else has money not my problem ! and don't even try taking it earlier , even if I do have funds in my account , you will wait till the 28th of each month.