yep they call and don't leave a message. If they want to get hold of me - the leave me a f**** message.
I called from my blocked number and asked who is calling - is asking me back who I am - so I said who are you because you called me and he hanged up. I am going to try again and tell him a fake name to see who they are. I am going to waste a lot of their time and then will say no to whatever they are trying to sell.