I got a call from 718-249-1400 today.  The caller told me that they are holding a contract with us to maintain the heating system of my home, and so the caller wanted to make an appointment to update the heating system.  However, my home does not have a heating system; and I suspect that this call may be from some sort of gang interested in robbery or some other illegal activity which would require them to enter my home.

718-249-1400 They have called me on my mobile at work a couple of times in the last two weeks. Never answer & hang up when I return the call.
Annoying! Is there any way to block that?

it's keyspan callign to try to get you to buy or renew a heating repair contract