This company calls anonymously in order to verify who the phone number belongs to. They then post the number on their website in order to sell your information to anyone who wants to buy it.
This is the local phone number for the pharmacy Advanced Diabetes Supply. They are not selling your information or anything like it. Their website can be seen here: http://www.northcoastmed.com/
They do not sell patient/customer information to anyone. They were probably calling for a refill of perscribed diabetic supplies. They cant leave detailed voicemail messages due to patient privacy laws. If they called you by mistake, you can call the number back and have it removed from their system. This change will happen immediately. Sometimes they might be calling about supplies for a family memeber. They are completely legit, call them and ask for me if you have any doubts.
I completely agree with Rick. We do business with this company and it is a great one. Nice people, easy to work with. If they've called you by mistake, they'll remove your number if you ask.