Who needs to do that when they are loan sharking the countries

I am probably not the best for advice, this harrasment needs nipped imo and consulting a lawyer seems like a good idea. I think it’d help having legal documentation in case it worsens. If they try to hurt your reputation then you have legal backup to sue and get a restraining order if it gets worse. They probably can help not going nuclear first too.

Please stay safe.

Always always leave a trail when possible. Email would be the best bet for an audit trail. After calling / conversatin, do a follow-up email to keep the audit trail and confirming what was discussed