This number keeps ringing me but not leaving a message therefore fits the description of a nuisance. If it is important to phone my number then leave a precise message identifying who you are....

If it was important would have left a message. I think it could be tele marketing trying to sell me raffle tickets that I don't want. I don't answer as I hate saying no to them but you have to draw the line. I think I will block the number

I called back number (07) 3053 3640 reached IVR for Clever Contacts.

This one came in on the mobile. I've had 20 nuisance calls in the last 2 days on my landline, all different numbers.