You should not have pressed anything. Do you really think pressing 2 put you on the do not call list? All that did was verify your phone number was valid so they could use it and sell it. Pressing 2 was just as bad as pressing 1.
Our cell phone companies are the ones giving out/selling our cell numbers. I only use my cell phone to talk with my immediate family, never give it out to ANYONE, for any reason, and still I get a ton of these calls!