Defamation can have a devastating effect on your personal and professional reputation and if you feel that you are a victim, then you need to take the necessary steps to fight the situation. Here are some of the main steps that you should take:
Understand the nature of defamation first – Simply put, defamation involves making false statements about someone that might harm their reputation. It can be classified into libel (written defamation) and slander (spoken defamation) and understanding the basics will help you recognize if you have a valid claim.
Gather evidence – It is important that you collect as much evidence as possible to support your claim and this could include: 
•    Copies of the defamatory statements
•    Context and circumstances as to where, when and how the statements were made
•    Impact on reputation, wherein you keep records of any damages suffered, such as loss of business, social ostracization, or emotional distress
Hire a lawyer – In such a situation, you will want to hire a defamation lawyer, because they will be able to assist you, guide you through the legal process, and help you understand your rights and options.
Send a cease-and-desist letter - Your lawyer might recommend sending a cease-and-desist letter to the person who defamed you. This letter demands that they stop making defamatory statements and may also ask for a retraction and apology. This step can sometimes resolve the issue without further legal action. 
File a lawsuit - If the defamer does not comply with the cease-and-desist letter or the situation becomes more serious, then you might need to file a lawsuit. Your litigation lawyer will prepare and file the necessary legal documents, which could lead to a court trial where you can seek damages for the harm done to your reputation.
Prepare for litigation - Litigation can be a lengthy and complex process and you need to be prepared for discovery, depositions, and possibly a trial. Your lawyer will provide all the legal support you need and will also represent you throughout this process to ensure the best possible outcome.
At Blackbay Lawyers, which is one of the finest litigation law firms in Sydney, you can find all the legal support that you will need.