Just got the call from "Financial Center Credit Union" for the same number and reference number.   I also have AT&T plus I got a text message.   I don't do text messages.   Now I will have to block them.   Sure sounds like a scam.

Has someone called AT&T about this? If they are sending text msg then ultimately the recipient is incurring charges by either paying for the msg becuase they dont have a txt plan or it takes away from the available txt msg's.

Got 2 calls this morning on my AT&T cell phone too. Card deactivation from Central National Bank of Enid. Called the actual bank in Enid, OK. Definitely a phishing scam

Got 2 call's from (418) 615-3159 today. One was from Finance Center Federal Credit Union and the other was SECURITY NATIONAL BANK, both UnKnown.

My cell is AT&T and I have a co-worker who is also with AT&T and getting the same messages.

Recieved a message that my credit card has been deactivated and I should call DMO4690296 to reactivate my credit card.

I got one late last week as well.  I have Verizon so this is not AT&T related. I did not receive a text message but the voicemail was pretty much exactly as you said.  It says the mailbox is full and cannot accept new messages at this time when you call them back.  Annoying.  I was heading out for a trip and certainly didn't need problems with my card.