Who called from 9490000000

I received unwanted calls from this number on a weekly basis, on my cell phone.

What can be done.

I will not answer them in the future.

This number has called me a lot but I never answer:

03/17/2015 03:28 PM Incoming Name Unavailable (949) 000-0000 00:08
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03/16/2015 05:57 PM Incoming Name Unavailable (949) 000-0000 00:04
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03/12/2015 04:52 PM Incoming Name Unavailable (949) 000-0000 00:13
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03/12/2015 02:08 PM Incoming Name Unavailable (949) 000-0000 00:04
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03/12/2015 11:17 AM Incoming Name Unavailable (949) 000-0000 00:04

WARNING!!! These are scam artists trying to steal your credit card number by selling you a service. Please report them to THE FEDERAL TRADE COMMISSION at (877) 382-4357. The more people complain, the more likely they will be shut down.

I forgot to add the most recent:

03/24/2015 11:26 AM Incoming Name Unavailable (949) 000-0000 00:04
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03/23/2015 04:15 PM Incoming Name Unavailable (949) 000-0000 00:02

they call constantly, and I have opted out and I have verbally asked them to stop calling me.