consistent dates

I have set up auto pay from my bank account. When I set it up no date or time frame was provided to me so I assumed it would come out on the billing date. I was wrong and was charged an NSF fee for not having the funds. I have been okay with having the money for the last few months. This month I had the money in my account but they were late taking out the payment and other things had gone through and the funds were not there. So I have been charged another NSF by my bank account. Can you please pick a consistent date for payment to come out instead of “approximately 15 days before”. I had the payment in my account for several days before they tried to take it out and now I have a $45 fee that my bank won’t reverse. This is very frustrating and not really worth the extra $10 off my bill if I am being charged $45 every time they take the payment out later than usual.