Who called from 3056300310

I got his in my email on 031517 and it came with an attachment, I did not download.
Here is what it said:
Here you go , you f**king thief.
Here is your subpoena:
Invoice 3311676
Thank you
David Bukzin
[email protected]
Junior Accountant
Phone: 305-630-0310
Fax: 305-630-5473

I received the exact same email, just different "invoice" number.  Same date also.

I got the same exact email to my work email yesterday. What is it about?

Here you go , you [***] thief.
Here is your subpoena:
Invoice 5817412
Thank you

David Bukzin
[email protected]
Junior Accountant
Phone: 305-630-1023
Fax: 305-630-0545

Unless that was delivered to you and put IN YOUR HAND by an officer of the LAW, it's fake. That is how subpoenas work