There was a scam which targeted landlines, where the scammer would call and then keep the line open while you "hung up" (except you didn't) and you dialled the

There was a scam which targeted landlines, where the scammer would call and then keep the line open while you "hung up" (except you didn't) and you dialled the known number of your bank. The scammer simulates a ringing line, and then answers as your bank.