This company does work for others.  They've been calling me on behalf of Cleveland Clinic which used to supply me C-PAP needs.

I get this call every 6 months from the medical center that I see for my sleep apnea CPAP therapy. They first do a brief survey on the quality of my treatment, then ask if I would like to order supplies. Last time I ordered, their price for my mask was about three times higher than at cpap.com. Since my insurance does not cover the first $300, I will no longer use these guys.

I also get annoying phone calls from them on a regular basis to replace stuff for my cpap machine.
It is for a company in Wichita KS.
I have asked them to remove my cell phone number and it has not happened yet.

ENOS is contracted to many companies that supply the CPAP to manage to ordering of supplies like hoses, masks, filters and the like.  Legit company

You were correct about the purchase.  I totally agree with you about automated calls, but when I called the number back (it was left on my machine) it was the renewal service parts for (in my case Enos), but I suppose other CPAP companies.  I wasn't home when the called was received so I called it back just to see who it was calling.  That's what it sounded like to be.  Seems to be legit because I signed an agreement to allow a 3rd party to call me to remind me to renew my order for CPAP parts.  

Maybe they work for other companies - I don't know.

I got a message from this number it was CPAP Plus...been years since I've ordered anything from them. Why they calling now????

I don't want this company to call me anymore

Received the automated message "An important call from Mercy Home Resp. Care regarding your CPAP machine. Is now a convenient time?" I hung up the first four times (over the past 3 week).  Today I said Yes, it's a convenient time.  Then the machine asked for my year of birth.  I hung up.

Just received the same call but # was unknown to me so I did not pick up.  Message left said important that they speak to me regarding medical ....wonder also, how they are aware that I also use a CPAP....put them on call block.

On October 30, 2010, I received an automated call from this number.  It said it was from "Alert Medical" with "important information".  The first thing they asked for was my date of birth.  No way am I giving that out to an unknown caller.  When I did not answer, it transferred me to "Customer Service".  I got the voice mail of a "Matthew Dolph" inviting me to leave a message.  I hung up.

I spoke directly with CPAP Supplies Plus ...      My  mystery  SOLVED ...
.... 4 -6 years ago I spoke to this company enquiring about their pricing ... left my phone number.
They enter my phone number  (belatedly)  into an automated reminder system.

I recall some of the US companies would, at that time,  not ship to Canada.   They now do so.

ched
I got a call from  877-559-1620 ... an automated voice enquiring about my CPAP needs.
Their supposed name,   CPAP Supplies Plus.   I ignored the call.  
Have not done business with them.   Have to wonder how they discovered I use a CPAP.