Play dumb call them and tell them your PlayStation 4 isnt working. Dont even acknowledge that it’s a ps5. If they ask you to send it back just send it back. if you are questioned when they receive the item or on the phone they call you out, just say you ordered a ps4, received that console and didnt know it wasn’t a ps4. Theyre the ones that sent you the wrong product so youre not at fault here, sort of dick move for them to report it stolen.