You can send a legal notice for wrongful termination however, if they don't heed then you would have to file a civil suit and seek damages which can be time taking and also the outcome would depend on what the mistake was and all. So, take a decision accordingly.
For any further queries, feel free to contact me on 7601090381 or firstname.lastname@example.org
What was the mistake ? For any further assistance, feel free to contact me on my e-mail "email@example.com"
Shubham Pabbi & Associates