Ah so your problem with this is not so much the wazeefas themselves but the effect of things that are unseen. Well first thing we need to understand is that the different types of creations have their own properties/characteristics/effects. For instance, if a person is sick, he is sick by the will of Allah. When he takes medicine and is cured, then this cure too is by the will of Allah. So it’s not that the evil jinn, magic etc is overpowering the will of Allah. It’s that these things have been created with their respective effects, which are not being overridden by Allah. But at the same time, He has also given us means to counteract those things. Otherwise, Allah himself says in the Qur’an:
So you can look at these wazeefas like a medicine for those types of afflictions.