Who called from 5304560021

I also got a call from "irs" & was told to call back nikki Johnson

I got a call from nikki saying she was from the irs. I thought they contacted you by mail. The number she called I don't use its my kids phone. Who are these people?

The second post in this thread by Alfalfa contains all the relevant information you need.  Read it, and then if you have questions come back and ask.

http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
http://800notes.com/forum/ta-8c2f64bf2b91fa5/irs-warns-of-telephone-scam

Report the Calls to the real IRS here:
•report the incident to the Treasury Inspector General for Tax Administration at 800-366-4484.
•You can also file a complaint with the Federal Trade Commission at FTC.gov. Add "IRS Telephone Scam" to the comments in your complaint.

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Do consider getting a call blocking device or phone.. You can google them and many are around $40.00 or so.If its a cell phone, some already have call blocking, if not, there are free apps on the web that will work for some. You can google this. If you have a smart phone, there is a free app called call control. Iphones appear to have apps also. Another one is called Mr. Number.