✔ 最佳答案
I believe the only way can do is call up the Hong Kong police to get help. If your friend is in force to sign the document, the document is not valid. However, this will be need to court procedure to dealing with.
To dealing with the "黑幫成員騷擾", I will suggest your friend and the family members go to Police Station to register his / her case first and report each time when they coming to the office / home 騷擾.
This will not stop them to looking for money back because of recovery the loan itself is legal. Your friend need to change the mobile and home tel no to stop the 電話騷擾.
1)可否控告入罪 - Depends on what did your friend sue the Bad Guy. You are better to ask for legal advise.
2)欠單是否有法律效力? - Yes but depends on the terms and circumstances, your friend need to prove his / her is under threat / misleading / misunderstanding to sign the loan agreement and asking the court judgement on the validation of the loan agreement.
3)拒絕償還款項 - The formal way is asking for the court judgement.
4)可否由法律制裁(police) - Police can do little on this matter. They cannot stop somebody to recovery the loan. However, register the case in Polcie and call up every time will get help on your friend because Police will checking the background on the bad guys to see any illegal. Your friend can do is to change all the contact tel no on he / she and the family members.
5)其他有效方法 - Court Judgement / Repay Loan to bad Guy. No other way can do.