When there are a lot of complaints on this site for a number like this, I like to include a link to this site's (whocallsme.com) relevant page to illustrate that I'm not the only one that this company is harassing. Not sure how much it helps, but they might be more likely to take action if they know it's not an isolated incident.
Here's where I lodge my complaints:
http://www.fcc.gov/complaints
https://www.donotcall.gov/

I have been getting calls from 360-322-6708 for a while now.  I recently started hitting the 1 key to speak to someone to ask them to take me off their list.  The bums keep hanging up.  today's call was the 4th time I have tried to ask them to stop calling.   I tried to call the number back  to complain  but I always get  "All circuits are busy now. Please try again later".    What gives?    How do you get them to stop calling?  

This number just called me with a recorded message from Credit Card Services.  It's been going on with different numbers.  I was told that pressing "9" would automatically remove me from callers' lists or that asking to be removed from their internal list would do the trick.  This is the second time that I pressed "9" and someone answered and I asked to please remove me from their internal list and was, immediately, hung up on.
The only way to win this battle is to disconnect the phone.  I don't even answer it anymore.

Waste their time. "Cardmember Services" robocalled me Wednesday dinner time. I touched 1 to speak to a representative. I showed enough interest to get "Nisha" to launch into her sales pitch. I gently set down the receiver and continued preparing dinner. Later, when I quietly resumed listening, she was saying "this is why you're gonna keep getting calls." Then she hung up.

ANNOY THEM LIKE THEY ANNOY YOU.

we are on a do not call list and this number has called us repeatedly and hangs up or we get some other message for something we do not want and did not ask for