Tenant complaining about each other

[Clement Familusi]

Hey, so I currently have 2 tenants in a 2 unit duplex (Top/Bottom) and the floor tenant is complaining that the upstairs tenant and her children are making noise... In retaliation, the floor tenant has proceeded to bang on the door of the upstairs tenant and poke the ceiling with a broom stick whenever they feel that the noise is excessive. I am now getting calls from both tenants about noice and even concern for safety. What is the best course of action?