Who called from 2133750438

This company continue to called my number on a weekly basic. I finally talk to someone on the other end. They would not give a name to who they were. she finally hung up.

I keep getting call saying they are a private detective trying to locate me on my voice mail.  They keep calling every day and I wish they would stop.

These people keep on calling Me & they know my personal info what can I do?

I don't know anyone named "Heather".  When I press 2 for No Information, it puts me on hold to speak to an operator anyway.  Don't answer this number if you see it on your caller id