Call multiple times and leave no message. Do not care if you tell them to stop. Hang-up right after you tell them to stop. While the service might be legit, the phone calls say otherwise.

"I'm calling from AMVETS the reason for the call is to give you a reminder that we have a truck going through your neighborhood next week. Our veterans could really use your support right now so if you have anything in the way of clothing or household items that you no longer use the vets would really appreciate your donation to schedule a donation you can return the call to 855-411-4650 or visit our website support the vets.org. Thank you."

On pick up, someone says, "No one is available to take your call at the moment."  This is repeated.  They stay on the line but say nothing else.

This is a rep for AMVETS.  He leaves a number you can call if you have anything you can donate to their cause.  And a truck will come by in a week or so, whenever they tell you, and pick it up.  I have donated and it is legit!

I did not answer.  I checked this site first.  They are now on my do not answer list.
Caller ID listed as "Unavailable"