Are you the drawer of the cheque or payee or holder in due course?. Was the loan backed up by a promissory note ? Have you such taxable income disclosing such accounted cash, if you are a businessman is this debt recorded in financial transactions. Contact a local advocate and act as per his directions.
Secunderabad/Highcourt practice watsapp no.9989324294
Supreme Court: If A Signed Blank Cheque Is Voluntarily Presented To A Payee, Towards Some Payment, The Payee May Fill Up The Amount And Other Particulars. This In Itself Would Not Invalidate The Cheque.
If the borrower had given you the blank cheques towards security of the loan amount, and is not returning the loan amount then you can fill the cheque, present it before your banker, get it dishonored, send a legal demand notice to the borrower, subsequently you can file a cheque bounce case under section 138 NI Act.