I am sure now that yes it is a scam. Why else call from a number that you cannot call back. I pushed 9 because at first I did think one of my CCs was offering me a lower rate. Then I was on hold for a while and then disconnected. These places offer to lower your rates which is something you can do yourself for free.
If you pick up the phone when it is ringing, it will more than likely be a collection agency on the other end looking for any kind of info to connect you to an account or create one. If you see the number on your caller ID and call it, you will actually connect to Quest Services.
It's called phone spoofing. This is mostly done by collection agencies. They pretend to be someone else and getting enough info from you to create an account. Next thing you will get is a paper threat to pay something in full or go to court. Some of us have been dealing with these bottom feeders for months and years. We have programs that track and trace these numbers and then match them to the time and dates with the phone company. None have matched the actual caller. They also spoof themselves as your neighbors. Advice: take your bill or some proof to the phone provider and have them trace. If you owe money or have ever in the past, you can bet places like these will be faking themselves as someone else to get the data they need. Type:"phone spoofing" in your browser or here's a site for a start: http://en.wikipedia.org/wiki/Caller_ID_spoofing . Everyone should be aware of these activities for their own protection. Also see: "predictive dialers" and "VOIP".
Note: Two known collection agencies that were tracked: Law Offices of Joe Pezzuto - Collect America and Portfolio Recovery Services
I pressed 9 because I knew it was a scam and wanted some more information to report them. DO NOT GIVE ANY INFORMATION TO THESE PEOPLE! I'm on the DNC list and I'm sick of these calls also! They only identify their company name as "Card Services" I spoke with a guy with very broken English and could hardly understand him. I asked which card they were with and he said Visa and Mastercard. I told him that those were two different companies and asked their company name, and said "card Services", so I asked their address and he said Orlando, FL. I asked the street address and he stalled and said my job is to offer you rates on your credit cards. I told him your wrong, your job is to scam people and told them not to call back and I'd be reporting them. I don't know if it will do any good, but I will anyway. No legitimate company operates this way.