ICICI Bank — Receiving threat calls and reminder messages even though I'm not a customer

Address:

Bangalore, Karnataka

I've received a sms from this id AM-ICICIB stating that there is an overdue on my ICICI bank credit card 444somenumber is Rs 70893.1 and min amount due is Rs 10270. The fact is that I don't hold any ICICI bank card. (Credit or Debit) I've never had any ICICI bank account also. I've no clue where this is coming from. Around 5-6 months back I got calls on 3 consecutive days from some ICICI agent in JP Nagar asking if I'm 'Mr Chakravarthi' and that I should pay the outstanding at the earliest. I called up some ICICI number and complained about it and then it had stopped. I don't know what kind of dumb people are sitting there in ICICI credit card section. Anyone with similar experiences? Please suggest what I should be doing. Thanks, Govindan