Step one- Don't summon a demon
>I've already done that, help!
Alright (idiot), maybe you tempted fate and came up snake eyes. Perhaps you live in a house with a bad history. At this point you have a problem and you need to deal with it, so lets get started. The sooner you act the better off things will be. If you let this stew it just gets worse and worse. Don't let some minor haunting ruin your life. If you let this thing get out of control it can literally run you out of your house and perhaps follow you afterwards. This thread is here to prevent the situation from deteriorating further than it already has.
>What do I do?
Assuming things haven't progressed too far you may be able to circumvent the haunting by simply ignoring it. This might sound too easy but often spiritual harassers feed off your negative emotions. If you're scared, depressed, anxious, angry, paranoid, or whatever other negative emotion you have the demon will feed off that. I don't wan't want to reference Freddy Krueger but it's basically FK rules. The demon subsists on your negative emotions and acknowledgement of it's existence. This technique is good if said demon is relatively benign but if it's been feeding off you for a while it may be impossible to ignore it's interactions if it can physically abuse you. If it's gotten to this stage a more desperate measure may be necessary.
>like what?
Assuming this thing is leaving marks on you, damaging your property, actively attacking you in your sleep and disturbing your mental state the option to "ignore it" may no longer be viable. It's at this point you'll need to consult professional help. Supposedly catholic priests are the most adept at handling these sort of things. Google is your friend here. Depending on how strong the demonic influence is they may recommend not going in a particular room and sealing with with holy symbols, blessing your house and baptizing you, or if the situation is extreme enough they may attempt an exorcism. The latter is quite rare and usually is for people who are possessed. Worst case scenario you'll have to leave the house permanently. Hopefully you haven't let things get that bad.
>Maybe I can reason with it? Maybe it's a tortured soul?
NO, do not under any circumstances attempt to contact the dead. This is probably what got your house infested in the first place and it's almost certainly going to make your situation worse. Assuming the best possible case (a non malevolent entity is trying to contact you) just ignore it. Don't give it any attention. If you're actively trying to "talk to the dead" it's like basically broadcasting a message to every kind of spirit to fuck with you. Most will ignore you but you run the risk of getting some sick SOB to haunt your house or fuck with you in some other way.
>I know a totally legit spirit medium and I they can hel-
No you retard. Don't talk with dead. You're basically asking to get fucked with by bad shit. Don't use a weegee board, don't use a medium and for fuck sake don't try to "talk to ghosts". Leave them the fuck alone. Don't acknowledge them and don't invite them into your house.
>What about praying to angels/prophets?
You don't need to pray specific angels or one off prophets. Pray to your main deity be it Jesus , Allah, Vishnu or whatever. Don't try to get fancy. The last thing you need is to let your guard down to some demon pretending to be an angel. THIS CAN ROYALLY FUCK. YOUR. SHIT. Consult your religious leader of choice before attempting a specific prayer outside the general deities. You're not a spiritual expert because you watched a few youtube videos. Don't be stupid.
>I'm atheist
So am I. Still no reason to tempt fate. Even if you're "above it all" and don't believe in demons or whatever else don't try to fucking talk to them. Think of it like pascal's wager except instead of the afterlife you get tormented by a demon who will fuck with you until you die. (possibly longer, who knows right?)
>Are tupla's demons? It's not the same thing right?
Tupla's are retarded. Still that's definitely an in for demons to fuck with you by hijacking your own stupid mind. Don't try to create tuplas you fucking sperg.
td;dr
Don't talk to ghosts or demons. Don't invite ghost or demons into your house. Ignore them. This isn't a game. They will fuck you up.
>what about styxhexenhammer?
He's a lanky faggot but he's still more qualified to talk to spirits than you. You're not styx. You're not a medium. You're a fucking pleb. Don't be stupid. Don't talk to ghosts.