Rang a couple of times but did not leave message

Caller: Clever Contacts

Rang and did not leave a message.Called back and the messaging service announced 'Clever Contacts' so presumably spammers.

Rang once and did not leave a message.

Caller: Unknown

Have rang me four nights in a row, have had their number blocked for two. Claims to be representing a charity when you call back

Caller: Clever Contacts

I called back and the message says they were calling on behalf of a charity. I adopted a cat from the RSPCA a few months ago and I've been getting all these calls since.

Caller: Clever Contacts

call back and it's a recorded message saying they represent charities.

Have rung every day for the last 3 days but no message left

Called for 17 secs, didn't leave a message or follow-up by email.