I've been called by this number just a few minutes after my friend tried to call me with this number

I get this number when I receive a long distance called from abroad. How is that possible? But it is.

Constantly calling my cell phone and doesn't answer when I pick up. They can call at least 2-3 times a day.

We receive one or more calls a day and no one answers when we pick up.

This Autumn person called my phone and said she needed to come see me Monday to sign an afidavit and to give me some legal papers. She said they are sealed and she doesn't know what it's regarding but told me to call this number to discuss with them. I call this number and they tell me its regarding a legal case that I am involved in but will not give me any details or information and will not tell me the name of their company or any other information. I also asked Autumn the name of the company she works for and she says she is a private legal courier and will not provide any additional information. this seems very suspicious and I have no clue what it's regarding but they want me to give them personal information, such as my address, place of employment, last 4 of my social, etc.

Received a call, called the number back...and it was a man. No voice machine or telemarketer.