Is the payment due on the first of each month but isn't "late" until the 16th?
Is the payment due on the first of each month but isn't "late" until the 16th?
If the answer to free9man's question is yes, then in reality your payment is in fact late as of the second of the month even if they do not charge a late fee until the 16th.
Continuing with the probability the payment is in fact late starting the 2nd of each month, you may want to check your credit report history as it is likely being reported as delinquent every month. Paying late by two weeks every month for years could cause a big drop in your credit score.