Called and asked for someone...obviously not me and I could hear them laughing in the background.

Seriously, don't you have something better to do?

do not call my number ever again contact me by mail.

Number blocked. Problem solved.

They keep calling when I tell them he no longer has this (mobile) number.  

Called from 256-263-5310.  They tell me each time they call they will remove my number from their computer.  Yet, they keep calling.