Capitec credit department - breach of contract!!

My debit orders with Capitec is scheduled to go off on the last day of the month because that is when I get paid. I am not sure what is happening in their credit department because this is the second time I get a message saying the instalment will be collected earlier. At the time of signing the agreement, I advised them that I get paid the last day of the month. Taking the instalment earlier is a breach of contract!!!