(866) 609-8298

This number claims to be "Citi" or Citibank. They ask for your account number, you tell them you don't have a citicard, they say that citibank also finances gas cards, so they want your gas card numbers to check - I told them to use the phone number they called from and they still could not name a card I had that Citibank was financing and they were calling about, but wanted more information from me as a "security check".

Never applied for a citicard.

Although I did not call the number 866 609 8298, I believe it to be bona fide. This is my story:
I started getting robocalled everyday from 877 587 5727 asking me to call the above # re my Citicard. I ignored it because I do not have a Citicard.
Some of the posts claimed that they called the number and were told their Citicard was over 28 days late and some others said that Citibank processed smaller store credit cards.
I checked and found out that my Citgo card was handled by Citibank, and yes, I was over 28 days late.
My bill was due Oct 8 and I forgot all about it (oops). I received a statement dated Oct 12 saying "bad person you are late and we are charging you an exhorbitant late fee. You have until Nov 8 to pay the minimum due". The robocalls started Oct 14 which falls in line with the 28 days late claim.
I made arrangements with my online banking company to pay them Nov 6 (yesterday).
If I am correct, in about a week, the calls should stop.

Same, different 800 number calls every day at the same time. Regards my Citi account. Recorded message says "Call us between 7am-11pm CST" We're on the DNCR.

Don't even have a Citi card, and we are on the do not call list.