ROT! Do not answer calls you do not recognize, do not push any numbers to remove yourself from list as all your doing is verifying a live number and never ever call back a number as your liable to get a nasty surprise bill or call some unsuspecting person or business that is having its number spoofed.

>>> .how the hell is that possible <<<
Call spoofing is what it is called.

phone spoofing explanation
http://en.wikipedia.org/wiki/Spoofing_attack
http://www.fcc.gov/guides/caller-id-and-spoofing
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http://consumerist.com/2014/03/18/florida-den ... y-telemarketer/
http://800notes.com/forum/ta-9f0ce767d8019be/a-different-spoofing-victim
http://www.foxnews.com/us/2014/07/26/colorado ... er-id-spoofing/

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.

Report your callers here, not just to the DNC alone:

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2

For text messages: forwarding any text message spam you get to the short code  “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.

By State DNC lists:
http://800notes.com/res/DoNotCall.aspx

FCC Abandoned Calls Complaint form:
http://www.fcc.gov/cgb/consumerfacts/1088D-R.pdf
email:  [email protected]