Idea Cellular — Life threatening calls from idea for number which does not belong to us.

We are getting life threatening calls from a number who is calming to be from Idea Collection agency. He is continuously calling us on our number [protected] for an outstanding amount/ Unpaid bill of [protected] which doesn't belong to us and which as per him is on the name of Mr. Devendra Singh (we dont know who is this guy). We tried to make him understand that it's not our matter but the person is not listening to us and abusing us. The contact number so called idea collection agent is [protected]. I want to have a strict action against the collection agency as without verifying any details he is giving us life threatening calls and harassing the family members also. Regards Gagan Aggarwal +91 [protected]