This number called tonight and it came up as "Alert" but left no message on the machine. Telemarketer?

did not leave message  Caller id said ALERT

Got a call from this number last night. It said Auburn WA. Left no message.

Another telemarketer targeting older people with medial alert devices.  Block this number.

This same number 253-245-2434 showing on my caller id as Alert, has been calling us relentlessly. When I pick up, there is a pause then a recorded message starts playing. No human to scream on the line so I can scream "stop calling me!!!". I contacted the FCC as I am on their Do Not Call Registry" and they advised me to keep track via my caller ID when and at what time they call. Then to go to the FCC online complaint form and file a complaint. Not sure if they actually go after these companies. They get billions of complaints. These places are scams. I don't understand why they can't be closed down and the owners put in federal prison.