Caller inquired information about elderly mother's medicare information and set up an appointment to come to her house

unknown call - i didn't pick up (and they left no message). Did a search and found this website

I received a call from this number. I did not pick up. No one left a message.  I tried calling the number back. No one picked up.

Received call about our account and when the woman came on, she said, "are you the customer looking to lower your interest rate?" When we asked which account are your asking about, she replied "your accounts?" Nothing specific was given. The caller hung up. We receive this call about 3 times a week.

We've been receiving calls from this company under various names and numbers on the caller ID. Sometimes several times a week for about 6 months now. When I press 1 to speak to someone and request to be removed from the list they argue or say to disregard and hang up. I'm going to start recording the calls. I've read that this is a scam to charge you $900 to call your bank and supposedly negotiate a lower interest rate.