I think, you need to pay better attention to your spiritual hygiene first. If you state you could only het the Djinn pretending to be Paimon, or other impostor.
Banish and cleanse your space, then call Paimon using a circle, and then banish again and set up wards. Wards are like closing and bolting the door so strangers can’t just walk in, but you don’t want to lock them in with you, so you banish first.
Try the 4th post down for an easy banishing technique