These people are calling from spoofed numbers and leave voicemails about “pending litigation against Deborah”. Well, I am most certainly not Deborah, and I have no pending litigations. Called back and got humans at 1:19 PM CST. They also use 877-263-8539. Called that one and got humans at 1:26 PM CST.
Called, sounds like they’re possibly a legitimate “arbitration company” (aka debt collector). Maybe a wrong number?
It is possible. However, I have researched them, and here it is: https://800notes.com/Phone.aspx/1-877-263-8539.
Also, welcome to the forum! 
Looks like you’re a relatively recent person. I myself have joined in late March, being sick and tired of scumbags calling non-stop lol
Their number rings once and hangs up. So much for legit.
Thank you for clarifying! Yes, I am quite positive that both of these numbers are scam: legitimate businesses generally do not call from numerous different spoofed numbers and do not have their names convoluted/concealed.