Caller uses the disguise of "Doctors Exchange" to make you think it's an important call. Was waiting for a call at a specific time from my Kaiser regarding a pending surgery date. When I called the Doctors office, they told me the doctor would be calling directly and not through a service.
They want to "help" you get those much need braces and other medical supplies. However, you must be between 18 and 65. Block the number. Get yourself a Panasonic phone system that blocks 250 numbers. A system with 3 handsets is less than $100. Check Amazon.com for one. A nice feature is when these bottom-feeding losers do call back; there is NO RING to irritate you.