2. If the nature of the case is a loan, then it is a civil dispute, which belongs to the jurisdiction of the court and cannot be managed by the procuratorate at all;
Conclusion: The procuratorate can't arrest people. If they arrest you, you can call the police or resist.
Attachment: Criminal Procedure Law of People's Republic of China (PRC)
Article 3 The public security organs shall be responsible for the investigation, detention, execution of arrest and preliminary examination of criminal cases.