I'm from the UK and I'm 13.

I got a call from an unknown number, I ignored it, they called again and I picked up. I heard "Is this \[My Full Name\]" from a Female Robot voice. They called me back 4 times and then I picked up again, it said "This is a call from Washington D.C Prison" and I instantly hang up. My anxiety got the best of me so I snapped my SIM card in half. I'm really worried. Should I be?