Could hear call center background noise but guy acted as if he couldn't hear me.

what company called me from this telephone number?

201 403 2596 calls several times a day,but dont leave a message or talk when I answer.

This company (Quantum Shift) calls my number at least 3 times each day. I am not interested in their name, product or services. They also don't leave any messages as to their reason for calling me.

How do I get my number removed from their contact list(s)?

This company (Quantum Shift) Called my house  today (3/31/11) at 10:03, 10:43,12:02, 12:26, 12:40,12:57 so far. (it's 2:00 pm as of now.) We have had a series of cluster calls from this number but they never leave a message, so we don't even know who they are or why they are calling. I don't answer because so many people say that they don't respond when you answer. I read about a scam where they collected people's voices by calling and recording them when they ansered. The caller's didn't say anything, just recorded the voices that answered. They intended to use them to breach a  voice recognition security system at one company. (Not in the general public, just with one company.) In any case, that has me spooked enough not to want to answer calls unless I know who they are and why they are calling.