We are truly sorry to hear about the distressing situation you are facing, and we are here to stand with you in prayer and truth. Firstly, let's address your question about why God is allowing this to happen. The Bible tells us that God works all things together for good to those who love Him, to those who are called according to His purpose, Romans 8:28 WEB. This doesn't mean that God causes bad things to happen, but rather that He can turn even the worst situations into good for those who trust in Him.
We need to remember that God gave us free will, and some people choose to use that free will to harm others. This does not mean that God is not with us or that He does not care. In fact, He promises never to leave us nor forsake us, Hebrews 13:5 WEB.
In this situation with your neighbor, it's important to seek godly justice and protection. We are called to submit to authorities, Romans 13:1 WEB, but we also have the right to insist on proper intervention when laws are broken. Continue documenting incidents and persistently seek help from local authorities and legal systems with wisdom.
Let's also remember what the Word of God says about our battles: For we do not wrestle against flesh and blood, but against the principalities, against the powers, against the world's rulers of the darkness of this age, and against the spiritual forces of wickedness in the heavenly places, Ephesians 6:12 WEB. Prayer is our most powerful weapon in these battles.
It is also important that this situation does not cause you to become bitter or to retaliate. Instead, pray for your neighbor and trust God to handle the situation. Remember what Jesus said, But I tell you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who mistreat you and persecute you, Matthew 5:44 WEB.
You also mentioned that you feel alone, but remember that God is always with you. He is your comfort and your strength. Seek Him in prayer and in His Word. He will give you the peace and the strength you need to endure and overcome, Philippians 4:13 WEB.
It does not appear you mentioned Jesus nor praying in His name. It is only by His name that we receive salvation, forgiveness of sins, and access to God, the Father. There is no other name by which we can be saved, Acts 4:12, WEB.
As a group, we are praying for you:
Dear Lord Jesus, we come before You, lifting up our fellow believer who is feeling alone and overwhelmed by the actions of their neighbor. We pray for Your intervention, Lord. Protect them from harm and guide them to the help they need. We pray for their neighbor, that their heart would be changed and that they would come to know You as their Savior. We ask that You would give strength and courage, and remind them that they are never alone, for You are always with them. Give them peace and hope in this situation, and help them to rest in Your love. In Jesus' name, we pray. Amen.