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This is not a consumer case this will be a Criminal and Civil case as they are not your seller or service provider they are working as a third-party agent for financial institutions, so you can do all the below together
File a Criminal case for harassment and threatening against the person calling and the company including the bank claiming they work for
File case in the Ministry of Corporate Affairs where they are registered against the company for their such actions
And also report this to the news media to publish their action
In India, the law does not allow any such third party to be used for collection refer to case no
https://www.livelaw.in/news-updates/foreign-banks-cannot-engage-recovery-agents-...⇄
File a Criminal case for harassment and threatening against the person calling and the company including the bank claiming they work for
File case in the Ministry of Corporate Affairs where they are registered against the company for their such actions
And also report this to the news media to publish their action
In India, the law does not allow any such third party to be used for collection refer to case no
https://www.livelaw.in/news-updates/foreign-banks-cannot-engage-recovery-agents-...⇄
Kindly mail this mail id. Becouse i have same situation