u/Many-Coconut-5517

We moved into a house in August that had an ant problem from the start. Found them pretty much in every room. We had flooring redone in one room, come to find out there was a huge infestation under the old flooring. Even in having that taken care of, we are still finding them all over the house. We have had an exterminator come monthly, put out baits, trying to keep areas as clean as possible- nothing is working. Any tips? Main fear is they have colonies in the walls and are traveling throughout the house that way.