I called back number (07) 3638 1507 reached voice mail for a charity company but did not say the name.

Calls, then hangs up as soon as you answer. If you ring the number back you are greeted with this message:
"Hi there, thank you for your call. if you're calling to check on a missed call then this is where it originated from. The call was made on behalf of a charity which you may support, or have supported in the past. We also call people to see if they'd like to support. If you would no longer like to receive contact from us, please email us at callingenquiries @ paretophone.com. This is an unattended message for your information. Thank you and goodbye!"

f*cking cocksuckers

Annoying charity call centre that calls you at least 6 or 7 times a week from different numbers. I can block them fast enough!

Annoying called me 12 times today

block now ive recieved 7 phone calls just today of the same so called company ✌

Many missed calls from this number returned call only to hear the voice message, I have tried to send an email to stop calls only to learn that it is not an email address, it bounced back

dodgy call chasing money

Just hangs up when I answer. has happened 3 times already

It's a paid charity calling service.
http://paretofundraising.com/contact-us/

Message on call back says its on behalf of a charity. But no further details.

Called and in usual fashion, I don't answer numbers that aren't in my phone. Checked on here and found out it's a charity. They left no message. Another one for the blocked numbers list. Any unsolicited numbers get the same treatment. When will they ever learn. Love this website and grateful to the contributors to it. Cheers!

Keeps calling me. Must be on sixth call this week, but missed each time.

Calls repeatedly but doesn't leave a message.

Called about conservation organisation, wouldn't give specifics.

Charity call centre. Caller does not leave a message. Call back and you get a recorded message. They do not tell you which charity they are from. Message provides an email address that you can send an email to request to be taken off the call list.

No message left & I couldn't call then back.