Frustrated customer

I am extremely frustrated with dial direct. When I took out their insurence I specifically said my debit must go off on the 25fh of each month but each month they have debited me exactly a week or 3 days before the 25th. I do not understand, this month I got debited on the 22nd of May, I'm only getting paid on the 25th. Where will I get the money because now I am stranded??? Anyways I need to shop for another insurence campany. This has been happening since I took out the insurance last year.