What steps can be taken against fraud by dealer

Mere se ek vyapari ne 5 blank cheque ye keh kar liye ki mujhe use payment dene aana Ni padega or vo transport se maal bhej dega magar baad usne payment neft se mangvai jb mne 4 months baad apne 4 cheque vapas mange to usne saaf ye keh dia ki usne mujhse koi cheque Ni lia h mne in sb pe stop payment laga di h magr vo inse court case karne ke liye blackmail kar rha actually mera usse total 200000 ka mall in six months me aaya jisme uske 10000 ka maal mujhe vapas karna h kyunki vo mujhe bata k Ni bheja gaya Jo mangaya usme mix karke bheja to ab mujhe apne cheque se kaise safety leni chahiye kya mera police me fir karne ka process h ??