This number is legit. Was very dubious when they asked for card info. Hung up and called number on the credit card. Account was overdue. CSR checked and this is the number of their past due department.
Received four calls from this number today. They left 2 messages, both with robotic voices. The first was claiming to be from Microsoft telling me there's a virus on my computer. The other message claimed they were calling from citibank and specified me by first and last name! Both robotic voices, both from the same number: 866.535.9492. [***]. Blocked!
Since March 2019, I have been receiving calls from (866) 535-9492 almost every other day claiming to be 'important message' from Citi Card. They even left a message to call them back. Good thing I never did and I found out about this number being a scam from googling.
Desperately wanting SS# or credit card info. Refuse to talk to you about it, unless you provide information they should have already if it really was Citi. Scammers fishing for an easy payday. I asked for a call back number and the Asian speaking lady gave me this number 1-800-680-0926. Be warned, another scam.