Who called from 3154329327

Called me about lowering my interest rate on my credit card.  It was an automatic message, and when asked to press 1 to connect or 2 to end the call, I chose "2".  The automatic message never identified which bank (if any) they were from (which was a huge red flag for me).

I just received a call from this number I answered no one was there, I called back and got a busy signal.

I received a call from this number, but I did not answer. When I called back an hour later
I got a busy signal.

No message, and busy on the call back

Automated call about lowering interest rates. Hang up! hang up! Hang up! hang up! Hang up! hang up!