Hello,
They have the right to file a case for recovery, but since it has been 8 months since they last sent you the mail therefore I do not think so that they will pursue the matter now.
If they are silent then do not take any step from your side.
If they file a civil suit then you will have to appear before the court and thereupon you can enter into a settlement.
They can file the case till 3 years, limitation as per law is 3 year and after that also they can file a case with an application for condonation of delay.
Do not worry and do not take any step from your side at this juncture.
Regards