Loud call center. A woman with a heavy Indian(maybe?) accent called our customer line and said she was with Citi Bank. I interrupted her to ask if she was requesting the service of out company to which she said no and started her pitch again. I interrupted her again informing her that you do not to call a business unless you are inquiring about their service followed by a request to be taken off their list before hanging up.
From my experience and the others listed here I would say this is a safe number to ignore and block when possible.
I can confirm that this was a call from Citibank customer relations as I had a problem and they called me to confirm that it was taken care of. As stated above she did have a accent (most likely Indian). They called my cell first and I didn't answer and then call my office number which I picked up.