My friend cheated me

hello i am in problem i have one best friend but my nowadays my friend friends with one criminal which already spend 2 yrs in jail 2 days before my friend call me and invite in their house and say me give me 5000 rupees if you wont give me 5000 then we will harm you and your girlfriend and complaint to your girlfriend parents you both are in love wants marriage they knows our parents against of our relationship...unlogo ne mujhe kafi daraya dhamkaya aur baad mujhse ek 10 rupaye ke stamp paper pe likhwa liya ki maine usse 5000 rupaye udhar liya hai agar nhi return kiya to wo mere uper case kar sakte hai aur agar time pe paise nhi diya to 5% har 5 din main interest dena hoga mere papa khud ek civil court advocate hai but main ye baatein unse share nhi karna chahta hu maine apne dost se bola ki agar main 5000 de deta hu to wo stamp paper mujhe de doge to unlogo ne bola ha de denge but agar wo mujhe stamp paper de de but unke pass agar xerox hua ush stamp paper ka to kya wo case kar sakte hai mujhe kya karna chaiye