You will have to leave a message since there is no live person to assist you. But hopefully that will get the point across. I hope that it helps.

Call back the number and ask to have your name removed. And tell them that if you ever receive another call from them that you are going to report them to the Ma better business Bureau. Hopefully that will put an end to them bothering you again. The BBB has a bit more pull and also I might suggest that you report it to the State of Ma as well. They can investigate this Co as well. More than likely they are a Scam looking to make a fast buck off of anyone who takes the bait.

they called my number and hung up when i answered.

These people are some kind of pyramid scam. They want you to watch some kind of video and sign up others to watch it. I listened to their spiel and was waiting for a human to come on the other end, which never did. They wanted me to leave my name and telephone number. I  didn't do that of course. But left a very nasty message telling them that if they did not take my name off of their list that I was going to report them to the authorities for running a pyramid Scheme which as most are illegal.
 I don't think that I will be hearing from them again.

Telemarketer, or otherwise unwelcome caller.