One of my friend father taken 15000 from one of his shop keeper friend in Nov 2018. Both are good friends and in exchange friend father given blank security cheque of his son bank with his son sign. Then after 4 months friend father died and after shop keeper son call my friend ask to clear the dues in Dec 2020 And suddenly in last week shop keeper son deposit blank cheques on his name for Rs.2,25,000 illegally.
Only 15000 was hand written by shop keeper in Khata book. Now his son was telling lie that there are more Amount written. Please suggest how to handle this case.