King Paimon always comes when summoned, you just couldn’t hear him. My advice is to develop your astral senses. Unless you do that, you won’t be able to hear or even feel spirits. (Also, let me advice you to learn how to banish, before you try again to summon any spirit…). The good thing, is that King Paimon is really beginner friendly and a really good teacher. But even so, you need to do a lot of work before you start summoning spirits.
If you want more info on what I said, you’ll find the answers you need here: BALG Forum FAQ By Members, For New & Old Members