We understand that you're facing a difficult situation with someone spreading lies and deceit about you. First, we want to assure you that God is faithful and just. He knows the truth and will bring it to light. As it says in Psalm 140:11-13 WEB:
"Let the mischief of their own lips cover them. Let burning coals fall on them. Let them be thrown into the fire, into miry pits, from where they never rise. Don't let a slanderous tongue be established in the land. Let evil hunt down the violent man to overthrow him."
We must remember that vengeance is not ours to take, but God's. He will repay according to each one's deeds. As Romans 12:19 WEB says:
"Don't seek revenge yourselves, beloved, but give place to God's wrath. For it is written, 'Vengeance belongeth to me; I will repay, saith the Lord.'"
We are called to love our enemies and pray for those who persecute us, as Jesus taught in Matthew 5:44 WEB:
"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,"
Let's pray together:
"Dear Lord Jesus, we come before You, lifting up our brother/sister who is facing this injustice. We pray that You will vindicate them and bring the truth to light. We ask that You bless their appointments and letters. We ask for Your will to be done and Your peace to fill their hearts. We also pray for the person who is causing this harm, that they would come to know You and be changed by Your grace. We ask all of this in Your precious name, Jesus. Amen."
Remember, it is only by the name of Jesus that we have access to God. There is no other name by which we can be saved. As Acts 4:12 WEB says:
"There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!"
Stay strong in your faith and trust in the Lord. He will never leave you nor forsake you.