Phone number disconnected and ported out by unknown and unauthorized person

On May 13th our phone number,  which has been assigned to our business since inception, was disconnected with no notice.  After numerous phone calls we were told that someone called and cancelled our service January 25, 2017 and reassigned to a residential account.  This was not done by anyone associated with House of Steep and was unauthorized.  There was no recording on the number it was merely reassigned and we were told there was nothing that could be done.  We have called customer service, technical support and the representative within Comcast assigned to our account.  No one was helpful, could tell us why the phone was disconnected or offer any resolution. We were finally able to speak with Robert Britt who was the only person within Comcast that was able to research the problem and trace the information on what had occurred.  Mr. Britt has since been trying to contact the new owner of the number and get it reassigned back to us.