I hope you can find some free help somewhere to help you fight them. If they are returning your mortgage payments, then they have no interest in helping you in any way, only in hurting you. I am so sorry.
I also received a call...it's legitimate...I filled out an online request for refi info with Citimortgage. They called at 10:30am and left an appropriate v-mail with a call back number. No issues here.
This is NOT a legitimate call. I've never had anything to do with 'citi' whatever, am based in Canada, and got a random call from this number with no reason whatsoever. It's garbage, ignore the number and the idiots/scammers in this thread who tell you otherwise.
The number id from Citimortgage. This is the number that called when I was refinancing my home. Do you have business with them. Did you ask for info on a refi or mortgage?