I'd certainly take any message from the Attorney General's office or public office with concern, sensitivity and urgency. Although we cannot provide legal or accounting advice, we certainly recommend that you contact your local attorney just to make sure everything you're doing is following the local, state and federal law and statues. It's always best to have a local attorney reviewing your practices and advising you locally within your state.
With that said, if it were me, I'd first look up the phone number and name provided in the voice message and just verify it's really the state Attorney General and not a realtor or angry property owner giving you a bad time. Usually from my experience, the Attorney General, would contact you via a letter. We've heard from a handful of people over the years on contact from the state attorney general or BBB, etc. typically via a letter/ complaint that can be followed up with.
I assume you have a business in good standing in your state (an LLC, Corporation, etc.). It would always be good to provide that information, especially in writing. If it were me, and the phone number verified that it is truly from the state Attorney General, I would call them back or have your attorney call them back. I'd ask if there was a material defect in the marketing material and any specific statues that were not followed and if they could provide that via written format in the USPS to you. Make sure you're super friendly and professional as these public departments and agencies do have a public duty to follow up on all complaints received by the public. That would allow you to address it and address any issues. There are a lot of scam artists out there and the state Attorney General is always addressing crimes and potential fraud and will always follow up on any type of complaint they receive.
It's always best to get whatever the issue is in writing. You're always best working with a local attorney to make sure you are always following state and local laws. If you receive something in the mail, it's important to always address those issues in writing and within 10 days. Usually providing more detail that you are buying real estate properties and have a business in good standing with the state with copies of a business license, and the Certificate of Good Standing from the Secretary of State should suffice. To my knowledge, there is nothing wrong with the marketing materials. Again, always best to consult your local attorney.