I have been getting these calls as well.  I am also on the National Do Not Call List and I have an unlisted number.  We are in Newfoundland and I have had this number call my house on a number of different occasions.  Won't leave a message.  I just refuse to answer this now.  They called at 10:00am on a Saturday morning.

I'm in Ottawa. It was an automated message saying "this is Lisa calling about your credit card. There is no problem, it's just to notify you that your credit card company has now qualified you for a lower interest rate as low as 6%. Press 9 to be connected to a representative." there was no mention of which company which screamed scam so I hung up. I tried calling the number back to see if it was blocked for incoming calls or if it would connect to a company. Turns out that identical automated message qualifying people for the lower rate is also on the incoming line. It went directly to the automated message with still no acknowledgment of any company.

Recieved a call asking me to "be connected to a representative" if I pressed 1. They said that their name was Lisa and that "my credit card company" was going to qualify me for 6% interest rate. It was an automatic recording and I hung up. They didn't say who my credit card company was. Thanks.

It costs them nothing if you don't answer, a computer makes the calls.It costs them almost nothing if you answer and tell them to f*** off: 5 seconds of someones time who is used to this kind of abuse.They probably expect that out of 10,000 calls about 500 answer and stay on the line long enough to speak to an operator. Of those 500 they expect 450 to tell them off and hang up right away. The faster those 450 get off the line the better. Out of the remaining 50 there is maybe one that can be ripped off. Half of the 50 can be disqualified within a few minutes each or 1 hour total. The remaining 'candidates' require a bit more time investment. In the end one operator may have to spend an entire day to find a single victim that can be scammed out of 500 bucks. Not a bad salary.In may opinion the only way to get back at them is to make it more expensive to find that one sucker in 10,000. This means you have to invest a little effort:** Play along and pretend that you are interested!** After stringing them along for a few minutes tell them that you are getting the paperwork or that someone is at the door, etc. Put the phone on mute and keep checking how long it takes them to hang up.** If you are bored and have a lot of time on your hands you can make it a game to try to waste as much of THEIR TIME as possible, just be sure to NEVER give them you real credit card number.If everyone of the original 10,000 callees would be doing this it would take them months to find the one sucker and they would be going out of business in no time. Even if 10% were doing it they would be done.Please spread this message!