Defamation

defamation depends upon the contents of the conversation, however, if the conversation is offensive, you can go for defamation,

Yes, provided You have a very cogent and proper legal evidence. Please give me Rank Five and follow me after reviewing my resume and contact me telephonically for further discussion and explanation if required.

Yes, it is. You can file.

Yes you can file a defamation case. In case of any further consultancy please connect with me.