What was the reason for crediting extra salary in your account? Was it for some commitment of future purposes?
You can contact me with complete details.
Before answer your question I would like to see the copy of legal notice then we will discuss your case
You can email me for advise on
Ethics says that you should return that extra salary as you have left that company and the company has complete right to recover that amount from you. For any further assistance, feel free to contact me on my e-mail "firstname.lastname@example.org"
Shubham Pabbi & Associates