>> the phone companies should be sued for accepting those illegal calls. <<
Phone companies are "common carriers".
That means they must allow everybody to use their services, unless the company is notified by law enforcement that the user is committing crimes.
http://legal-dictionary.thefreedictionary.com/Common+carrier
http://www.cybertelecom.org/notes/common_carrier.htm
http://en.wikipedia.org/wiki/Common_carrier#Telecommunications
However, recent FTC & FCC rulings state phone companies may allow customers to block certain unwanted calls; BUT the phone company cannot universally block a number merely because YOU complain ... however, they might give you the ability to block those calls to YOUR phone. Even better, you can protect yourself, by obtaining and using a call blocking phone, app or other device.
Do not depend on others to enforce rules or policies YOU invent! Protect yourself!
The FTC and top communications companies met, to determine what they can do to stop robocalls and other illegal calls. Here is a link to a frequently updated page, showing the history and progress of their initiatives:
http://www.phonehelp.2truth.com/initiatives.html
~~~~~~~~
Please reply to this post, to let us know you read it, or have taken suitable actions to protect yourself.