I called back number (07) 3613 6290 reached voice mail for a charity company but did not say the name.

greenpeace charity collectors

It's just greenpeace, they're not usually harassing.

Calling daily but hanging up when I answer.

You'd think they'd get the message after not answering more than half a dozen phone calls.

read comments, didn't pick up

To those who answered the call, have you checked your phone bill for any suspicious charge?

I only call back an unfamiliar number IF they leave a voicemail (I don't answer unfamiliar numbers). These people have never left a message so have blocked them now.

When I answered the line hung up. I returned the call there was a voice message saying they were a charity but did not state the name.

keeps calling me on a daily basis but won't ;leave a message

No message left. Called around lunch time.

Called without leaving message.

No message left. Called around dinner time.