I've been having a problem with flies in my apartment that I can't get rid of. They look like fruit flies from, and behave like them too. They are attracted to food and definitely are too small and slow to be a house fly. I have tried the normal trap of apple cider vinegar and some dish soap, but after three attempts I have yet to get rid of them. They aren't even attracted to the trap because there are never any flies in the solution.
What are these flies and what else can I try to get rid of them?
EDIT: apparently they were fruit flies... Or some other fly that is attracted to apple cider vinegar. The last few times I have tried this the traps have been completely empty, but now all of a sudden it is full of flies. Confusing, but I'm glad it's finally working.