I called the number back and talked to a nice gentleman at Orbit Medical Inc.  They supply in home medical equipment.  I do get oxygen and have an oxygen machine, but supplies are sent from another medical equipment supplier.  He couldn't tell me why it is generating so many calls and why almost all calls no one responds when I answer.  I told him to google their ph# to look at all the complaints. He did say he would pass this info on up through the chain of command.  We'll see if that helps.