Am tired with with this company almost every month am complaining about one thing, we have an agreement for the 30th of each month debit

Am tired with with this company almost every month am complaining about one thing, we have an agreement for the 30th of each month debit. But on air alwys debit on the 24 or day after only for the debit to bounce cause of insufficient funds, ive raised this many a times cause now i have a 5 missed payments on my credit profile and its killing my score. One thing again ive been nagging them to send me my statement so i can send to credit bureaus for updates they dont answer me nxa am fedup