These buggers ring up everyday when I'm at work and don't leave a message on my answering machine. They just hang up. So sick if this crap. I have turned my answering machine off now .

Got a call from the scumbags aswell

hangs up on answering.

Driving me crazy, I won't answer if I can't identify the no. Then I edit the number to Do Not Answer.

This number has rung home landline and my mobile several times at 7.10 pm

Use an answering machine. Do not pick up until you identify the caller. Make sure your message tells friends and legit callers that you will answer only when they are identified.
Call centres, spammers and scammers will not leave a message.

called this number several times and was left on hold each time

serial pests

I called back number (07) 5657 0893 reached IVR of company called charity fund raiser.

Pest