Aggressive continues calling from varying numbers

I answered the call but was silent. It is among many that keep coming and are just silent calls and then they hang up - my list of blocked numbers now is huge

They keep calling every day sometimes twice
I’ve told them I’m not interested and not to phone again but they keep calling I ignore the call now

Answered the phone but was just silent. I only said 'hello' to make sure other phrases were not recorded in my voice as was extremely suspicious.

Quite suspicious as this seems to be a "block" of numbers they use as I had a 0488 830 808 which is just one number off the 809 I just got. Never leave a message like genuine callers do.

keeps calling when i phone back it disconnects the call