Don't know why they are calling. No messages just constant calling

I keep receiving calls at work (4 days now) they will not tell me what it is regarding. keep trying to talk over me when I am trying to request information and today called wanting my HR department so they can send them legal papers. I can't get anywhere. I have each time told them not to call me at work since they will not say why they are calling but they call back within 1 minute. Any suggestions?

received unwanted (spam) text message regarding debt consolidation

This number called me five times in a row, with no space to breathe between calls. They did not leave a voicemail. I tried to call that number back but I got a strange recording... Not really sure what this was about?

They call several times a day, and when you call back they will hang up on you over and over again! Very annoying and kind of scary!

Indian Company named Global Telecom/telelink, using very obsence language if you say no to them about their calling cards. Talk to alternate people, saying other person has asked to talk to them. Speaks indian languages - Hindi. Uses vulgar words if you ask them to stop calling.

I do not understand everything this person is saying in the message, but he says for me to call him back regarding an urgent matter or to have my attorney of Record call him back. He has called 3 times so far in the last hour. He also said he knows my social security number.

These people identified themselves as the Coalition Against Breast Cancer. I gave a one-time donation, but they have charged my credit card six times in 4 months. When you call the number on the credit card statement (above), you get a recording. There is no one to accept or return calls. These people are scammers.