Weird phone calls from potential process server

For context, I am in Texas.

I received 2 phone calls (today and yesterday) from an unknown number. The voicemail left states the callers name, and that they are a process server looking to get some signatures on legal documents. They state they will come to my home or job between the hours of 3-6.

The number they provide is a toll free number that does not come up as registered to any business on google. They stated that it I had any questions to call the “law offices of PMG and associates” but I cannot find an office by this name.

I am unsure if this is scam call or if it legit. I’m unsure what to do but of course, I am scared shitless. I do have some debt that is being worked out but other than that, I am unsure how to handle this.

Any advice would be appreciated. Thank you!