This is Medco. Just call the number back to see for yourself.  The Privacy Act prevents them from leaving messages on answering machines.

Privacy laws do not preclude them from leaving messages on answering machines. All those laws are for is to keep them form releasing sensitive information without your permission. They would be just fine, legally, and so much more customer friendly if they would leave a message saying something like, "This is Medco calling for XXX XXX. Please have XXX XXX call us back at xxx-xxx-xxxx." That does not release any sensitive information, and lets the called know who is calling. Also, someone who receives such a message and knows who Medco is, would be more likely to call them back either to talk to them or to let them know that they are calling a wrong number. But, not leaving a message ensures that they do not get an answer or a call back from the majority of people.

Well that statement is bunk, because even with HIPA they can leave a message of their name and who the call is intended for and to have that person call them back and ### ### ###.

I get Scripts from Medco and I KNOW they do not call you UNLESS you have given them permission to. I just posted a message a few seconds ago after receiving this call. I also wrote to Medco. This is NOT Medco calling.

Wrong.  I terminated doing business with Medco because they cheated me.  I tried dealing with them through email and they refused.  They kept telling  me to call them.  They continually call me.  I never answer the phone, but I verify that it is medco before I erase the number from my caller ID.  I have never given them permission to call me and yet they never stop.