Received call on answering machine, no message.

Left a partial, recorded message on my cell phone's voicemail which is registered on the Do Not Call list.

They call OFTEN, at least today and yesterday. Yesterday I pressed '1' to talk to 'someone to reduce my percentage on credit cards'. The person hung up on me when I asked to be put on his do not call list.
Today I pressed '1' when they called and I asked what company they were with.

At first the person said "VISA or Mastercard'.
I asked which one is it?
Then she said "This is Card Services"
I asked again, "But what is the name of your company?"
Then she hung up.

My report to the Do Not Call Registry:
Initially a recorded message from "Jennifer" who said it was "urgent" that they speak w/me regarding lowering my interest on my credit card balances (balances which I do not carry usually).
Rather than press "1" to talk with an "operator", or "3" to discontinue calls (which are illegal), I hung up. I've had enough of these jerks and their deceits, lies and misrepresentation; just as I've had enough of the virtually phoney "Do Not Call Registry" which is only for honest businesses. Until some teeth can be put into this law and violators actively pursued reports such as this are 99% a waste of time.

You need to quit pressing any keys.  They will never take you off their list that way.  Just hang up.   If you have caller ID, do not answer blocked calls or calls from people unknown to you.