We are truly sorry for your difficulties. This may be a legal issue best referred to an attorney.
As described it does appear there may have been unauthorized activity. Our recommendation is to collect your facts and schedule a meeting with your agent and the seller's agent to review this sinerio. Hopefully, a positive direction will result from this exchange.
Formal notification would be sent to board and state. Listing agent could provide you those locations contact numbers, address
What does your Realtor say?
What does their broker say?
The buyer's Realtor is not able to authorize shut off of the utilties because they are not on title.
They ARE able to turn them off (gas shut off) for tenting. IF the treatment is authorized.
It sounds to me as though there is miscommunication, not intentional damage.
Your REaltor or attorney is the best person to ask...not us.
I am not an attorney. Anytime there is a dispute, it is typically first elevated to both parties brokers. It might be resolved between you the seller, brokers, and buyer via compensation etc. but it is dependent on what your contract states regarding the handling of disputes.
Without knowing the speicifics, or being a party to the transaction, what I can tell you is the first step would be to contact the Realtor's Broker. If this does not result in an agreeable conclusion, for all parties, each state has different laws governing the complaint process. I would suggest contacting your local Realtor Association to find out what the next step would be. You can slo contact the National Association of Realtors. It may be that there was a miscommunication, or misunderstanding.
The home buying/selling process can often be stressful enough, so I am sorry that you are having this experience. Good luck!