I called back number 0491 692 328 reached voice mail for a charity company but did not say the name

Caller: Japanese pre recorded voice

Phone line went blank then transfer sound then “ kne how Wha tashi wa. Blah blah blah

Caller: hung up

Rang and when I answered they hung up. I have blocked this number. They have probably already add my number to some list they're going to sell to say it's a live number :(

Caller: 0491 692 328

Same issue. Called back and couldn’t leave a message - mailbox full. Presume it’s spam??

I keep getting missed calls from this number and they never leave a voicemail. I have now blocked them.

Has called me twice a week for the past 4 days. Doesn't leave a message and calls at random times. The most recent being 7:45pm. I don't answer numbers I don't know and this one is getting added to the block list.