Call no one was there when I answered

Left a message in reference to a credit card.  I thought it was illegal for solicitors to call cellphones.

Called about lowering credit card rate.  Prompted me to press 1, a female rep came on and asked for my name... and then hung up.  I just don't get it.

They call every week and no one is there. They do not care about the do not call list.

We have received several calls from this number and other numbers in the sequence 506-226-456x.  When I tried to return the calls, we get a message that the number(s) aren't assigned (in English and French)... message ends with code 25, whatever that means.

Apparently, this area code is for New Brunswick, Canada (GMT -4 hours)... where we don't know anybody (including legit. businesses).

We have stored these numbers and plan to answer, if convenient, just to waste their time, shame the rep. (about his/her career choice), and cut down on their calling yield... if we have the free time, we're gonna waste theirs.  If you're like-minded, don't forget to ask for a Supervisor/Manager of the rep... give a little extra adrenaline rush for the rep. (just before he/she hangs up)  ;-)