persistent phone calls at all hours

I keep getting data calls form this number to my cell phone. I called the number back and they won't tell me the name of the company or what they sell or manufacture. Is this the way they circumvent the do-not-call registry by NOT giving their name? i asked to be put on their do-not-calll list and they said they cannot do it, I must officially request that from the person who calls me - but it's a data call! There is no one there when I answer it.

Hijacked e-mail accounts send out messages about fake diploma scams and request the recipient to call thisnumber.

Always has recorded message saying that the call is for "Agria Truatt". I get this constantly and I AM TIRED OF THESE "NUSINCE CALLS"

Left no message

No one on the other end of phone responded and I heard a beep like the call was being recorded

I've received 5 calls today. Asked do not call again, but they keep calling.

I have one of those buttons you push when a telemarketer calls which states this number does NOT accept these types of calls and to please remove it from their calling list. They called 14 times yesterday. So far 4 times today and I have been around to push the button 3 times. They just keep calling back.

They call me relentlessly. Please make them stop

Called my cell phone. Hung up when I answered.