I do not understand my date of debit is provided o...

I do not understand my date of debit is provided on my contract on the 30th every 30th of the month they gave the 25th how it is to pre-call 5 days in advance it's weird I understand I have to do what because the debit is scheduled for on the 30th of each month I don't understand this mess against in interviews norauto brothel pass