I've block all calls coming from any (02)90 numbers. They all seem to be for solar power and although I have told them repeatedly to stop ringing they keep at it. Usually around 3pm in the afternoon and everytime I block a number another appears. This has been happening for over 3 months. You would think they would have given up by now. I don't answer anymore just cancel the call and then add it to the blocked list, which is getting bigger by the day.

Caller: Green Installers

This number has called 4-5 times in the past week. No message left.
I rang the number back and asked who they are. They are a solar electricity seller.
My number is on the "do not call" list.
When I reminded them of this, they hung up.