My friend misuse my blank singned cheque and file a case

Hi sir i am runing a mineral water plant last year my mother was suffring frim cancer at that time i was with her at hospital for 3 month so one of my relative and my friend is taking care of my plant they often came to hospital for payment i had given a blank cheque to them for purchasing a raw material but they misuse my 2 check before presenting a cheque into bank they tried to blackmalling me on the behalf of cheque so i filed a DDR 3 march and informed to the bank that my cheque book was stolen so please distroyed my cheque book bank did same day after a week i published in news papper that i lost my dacument with singned blank cheque so if some one found please inform me but after 1 month my friend filled cheque amount 5400000 and presented in bank for clearing bank returned with memo tha please contect to drawer or drawee bank an prestend again after 15 days another cheque was presented amount 4700000 on the name of my relative now i recive a saman for the same what should i do they follow all the parameter to serve a notice to me