Whoever is calling from this number first calls from 543-465-4768. Then he tells you to call 347-627-1136 because of a urgent legal matter. He says he's from legal department of BCS/so who are they?

I ran the other here you listed as getting a originating call from:

http://800notes.com/Phone.aspx/1-543-465-4768

After reading some of that, that number is associated with a extortion scam operation regarding pay day loans. The above posts also indicate extortion scam operation. In fact one poster points to BCS imposters. He is indeed spot on, there is a real BCS agency I found upon googling. None of the info match's with the numbers here, either from your originating call, or the call back number.  It is not unusual for extortion scammers to use and abuse a real agency's name.  

Here's the info on the real BCS:

http://www.bbb.org/denver/business-reviews/co ... 2296/complaints

As you can see, the phone numbers do not match up.  You might contact them regardless in this matter, it would at least give them a heads up their name is being used and abused by extortion scammers. One important thing to remember if these extortion scammers have any of your personal information such as your social security number, date of birth or drivers license make sure you register with identity protection notify the credit agencies as well as your banks!!
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credit reports:  Experian, Equifax, TransUnion
http://www.consumer.ftc.gov/articles/0155-free-credit-reports
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How to see if your on the chex system list:
http://www.wikihow.com/See-if-You-Are-on-Chexsystems-List


For Extortion Scam Operations,  File reports with the FBI, your state attorney general and Department Of Justice,CFB,FTC & FCC..

http://www.nw3c.org/
http://www.ic3.gov/default.aspx
http://www.fbi.gov/
http://www.stopfraud.gov/report.html
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
http://www.consumerfinance.gov/complaint/
http://www.fraud.org/

Also read up on the laws and your rights:

http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know
See Residents post here also:
http://800notes.com/forum/ta-34af6a034ba34b6/unending-collection-calls
Templates of Letters:
http://800notes.com/Phone.aspx/1-319-242-7350

http://www.ftc.gov/os/statutes/fdcpajump.shtm
http://www.consumerfinance.gov/askcfpb/search ...
http://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-reporting-act.pdf
http://www.consumer.ftc.gov/articles/0149-debt-collection

And see:

http://800notes.com/forum/ta-944ec1426a8bcbb/ ... service-attacks
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http://www.clarkhoward.com/news/clark-howard/ ... r-phones/ndF4c/
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http://www.net-security.org/article.php?id=1828
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http://800notes.com/forum/ta-86217073a9c8dad/ ... 077595690349410
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http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
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http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
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http://www.fdcpa.me/fake-process-server-injunction/
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http://800notes.com/forum/ta-9413b3202bc8b6c/ ... net%27s-tactics
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Said name was Jack Watson. Heavy accent. People speaking in the background. Called an office looking for someone but referred to them in the wrong gender. Asked to call back for urgent legal matter.

Someone from this number keeps calling me on my cell and at work, He says he is officer Allen Watson from dcs? Also says they have my soc sec # and have a case against me.

This is a criminal extortion scam operating out of India. They are making the calls utilizing VOIP and the names of legitimate firms to make it appear the calls are originating from within the US. There is NO "company" or "debt" and you will NOT be arrested. They are harvesting and/or buying consumers' personal identifying information and you need to do whatever you can to protect yourself. This includes: Notifying the FTC: https://www.ftccomplaintassistant.gov/, placing fraud alerts with all three credit bureaus, notifying your bank and employer and letting these criminals know you are aware they are attempting to extort money for a non-existent debt and have alerted the authorities.