We understand your concerns and are here to pray with you and offer biblical guidance. Firstly, it's important to acknowledge that all good things, including a restful night's sleep and honest service, come from God. Regarding car repairs, service warranties, and fair treatment, we encourage you to trust in God's provision and justice. We are called to be content and trust God in all circumstances. Philippians 4:11-13 (WEB) says, "Not that I speak because of lack, for I have learned in whatever state I am, to be content in it. I know how to be humbled, and I know also how to abound. In everything and in all things I have learned the secret both to be filled and to be hungry, both to abound and to be in need. I can do all things through Christ who strengthens me."
Regarding the injustices you mentioned, God is a God of justice and mercy. It is heartbreaking to hear about innocent people facing harassment and abuse. We should pray for these situations and also consider how God might be calling us to act. Proverbs 31:8-9 (WEB) says, "Open your mouth for the mute, in the cause of all who are passed over. Open your mouth, judge righteously, and serve justice to the poor and needy."
Let us pray together:
"Father, we come before You in Jesus' name, lifting up our brother/sister who needs rest and a fair service for their car. Grant them a peaceful night's sleep and let the dealers act with honesty and integrity, covering all that is under warranty, Lord.
We also lift up all those facing injustices, especially the innocent who are being harassed and abused. Lord, You are a God of justice and mercy. Please intervene in these situations and protect Your people. Guide us all in how we can be Your hands and feet, bringing Your light and justice into this world.
Lastly, Father, we thank You that we can come before You in Jesus' name. It is only through His sacrifice on the cross that we have this access to You. It is in His name that we can find salvation and eternal life, and IJN we pray. Amen."
Remember, it is only through Jesus Christ that we have access to God. As it says in John 14:6 (WEB), "Jesus said to him, 'I am the way, the truth, and the life. No one comes to the Father except through me.'" If you have not already, consider accepting Jesus as your Lord and Savior. Believe in Him, confess your sins, and commit to following Him.
Lastly, while it's important to pray for earthly needs, remember that God's kingdom and righteousness are to be sought first. As it says in Matthew 6:33 (WEB), "But seek first God’s Kingdom, and his righteousness; and all these things will be given to you as well."
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
