We are truly saddened to hear about the demonic oppression and possession you are experiencing. First, we want to assure you that deliverance is possible through the power and authority of Jesus Christ. Remember, Jesus has given us the authority to trample over all the power of the enemy, and nothing shall by any means harm us as stated in Luke 10:19 WEB.
Let's address the issue here: demons do not have any legal right over a believer in Christ. They cannot possess them. They are not able to do anything to them unless they have an open door. That door is usually opened through willful disobedience and sin. We should be blameless and pure, children of God without rebuke, in the midst of a crooked and perverse generation, among whom you are seen as lights in the world as stated in Philippians 2:15 WEB.
If you have not yet accepted Jesus Christ as your Lord and Savior, we urge you to do so now. Confess your sins and ask Jesus to come into your life and save you. It is only by this that we have access to God as stated in John 14:6 WEB. Jesus is the only way to the Father.
You mention you have not been able to get rid of them. This could be due to several reasons. First, make sure you are approaching this battle with the authority of Jesus Christ. It is in His name and by His authority that we cast out demons as stated in Mark 16:17 WEB. Without faith in Jesus Christ and the use of His authority you cannot be successful.
Second, ensure there is no unconfessed sin in your life. Demons will use your sins to have control over you and can even cause illness as stated in 1 Corinthians 11:27-30 WEB. Also examine your own life to make sure you are taking thought of the Lord Jesus to protect your own mind and thoughts.
Let us pray for you:
Dear Heavenly Father,
We come before You in the mighty name of Jesus Christ, seeking Your divine intervention in this situation. We plead the blood of Jesus over this person and command every demonic oppression and possession to leave in Jesus' name. We bind the strong man and cast him out along with every other demon. Father, we ask You to fill this person with Your Holy Spirit, and give them the strength and faith to resist the devil and his schemes. We pray that You will reveal any open doors or unconfessed sin that may be hindering their deliverance. We ask for total and complete deliverance and freedom in Jesus' name. We come against any curses, hexes, vexes, or spells. We come against any spirit of infirmity or weakness and pray for complete healing in Jesus' name. We curse these demons to the lake of fire. We also pray that this person will come to a saving knowledge of Jesus Christ if they have not already. We ask you to convict them and bring them to Jesus Christ.
Father, we thank You for Your faithfulness and Your promise to deliver us from evil. We trust in Your power and Your love for this person. We pray this prayer believing that the demons are gone, the curse is broken, the sickness is healed, and the person is free in Jesus' name. In Jesus Christ name we pray. Amen.
Continue to stand firm in your faith and resist the devil as stated in James 4:7 WEB. Put on the whole armor of God to protect you from demonic assaults as stated in Ephesians 6:10-18 WEB. Surround yourself with a community of believers who can support and pray for you. Do not give up the fight, for greater is He that is in you, than he that is in the world as stated in 1 John 4:4 WEB.