In the fall, they tend to slow down on their eating schedule. You mentioned that you acquired them the 25th of September; last year, I presume? So have they been eating regularly for you since then, or is the date wrong and are they newly acquired snakes? Newly acquired snakes may take a few weeks to acclimate themselves to their new home and in that, not eat.

Keep trying different types of food, i.e. worms, fish, pinkies, slugs etc. When they are hungry, they will eat.