this numver keeps calling leaving no message

keep getting calls from this number and when I answer or answering machine answers they hang up

Received calls and text messages form the above number. Reported to 'Do Not Call' Registry

I have spoken to Mr. Gary Thomps about a collection. I informed him I was at work and will take care of the matter once i got home. he began to call my job and harass employees. He also started to cuss my boss out demanding that i pay the debt, which I didn't have at the time now he's making threats that he going to make lose my job.

no message; then a text

They are calling my home and hanging can please stop this company from calling me.

This caller keeps calling and never leaves a message. If I answer they say goodbye and then they hang up

Have received a couple of calls from this number even though we are on the do not call list.

Found out through reverse look up that the Company name is: Global Crossing, a business newwork company, why would they be calling me??? If this is a Debt Collector, they are using someone else phone number.