My best advice is that you shouldn't banish what you do not know about. Summoning and banishing entities can be dangerous if you are new. I would recommend consulting with your local church or coven to help you out. Just remember to banish any negative energy, cleanse, and protect yourself as much as you need too. It would help if you research if this is a demon and their association with wherever it is at. Sometimes situations are not what they seem. Spirits and other entities can be respectful if you show that respect back. They can respect you if it is your house or something and you ask them to leave. It really is situational, so take caution & obtain what you know before going to different measures.