Pulled the wrong tooth and patient filed a complaint.

I treatment planned a patient for a full extraction of the upper teeth and a interm denture. During consultation with front desk, patient wanted to keep #5, 6 and 11 and do a partial due to finance. I was not consulted about this and the treatment coordinator just put the treatment plan. I was working for Aspen. During the day of the procedure, I verbally said that we are going to extract all of the upper teeth. Patient didn’t say anything. He later called confused and then I realized what had happened. He signed a release of liability in exchange for making him dentures for free and fillings. It’s been a year and I just received the notice for a board complaint. I am not sure what to do at this point. Anyone has any advice? Should I call the patient and try to sort things out? Can he withdraw the board complaint? Should I hire a lawyer? Am I gonna lose my license?