Patience is the key when dealing with Ants as you may have more than one nest to eradicate. Ensure Ants in ya Pants is out in the area where there's an Ant trail, you will then interrupt that trail to or from their current food source and they will take the product back to the nest.
The Fiprinol then kicks in as they feed it to the nest, wiping out the entire colony.
Before you call the professional sin, give it another crack & with time & patience you should get the result you want.