Indusind Bank — getting threatening calls

I have been getting call from indusind bank past 3 days from numbers:
[protected], 48381807.
They are saying someone i know only by name has taken loan from them and not returned, even after me constantly telling them that i have no contact with that person, they are calling me daily and saying that i will be in trouble and that they will call people in my known and say that i am at fault. I have no clue about anything and getting such kind of calls from bank which is just not acceptable.
Please look into the matter on urgent basis.