FBI will be sending subpoena

I own a small dealership and I recently received an email from an FBI agent asking how to serve me a subpoena. I called the FBI headquarters and confirmed that agent works there. Ive tried calling her multiple times and she never wants to speak to me. She sends me a follow up email stating she will serve the subpoena next week.

This comes after there is a complaint to the DMV from a client to my dealer for alleged damage that I did not know about. For the record, I'm no con artist or a scammer. I sell used vehicles and i take care of my clients always. After sending all the requested info to the DMV I get no response from the DMV employee. A week later I receive the email from the FBI agent.

Could it be related and do they believe I have done something wrong? There was a few mistakes on the title which i had submitted a statement of fact to fix.. other than that i cant think of anything else but I am freaking out about it...

Any input on the matter would be appreciated.

Location: Houston TX