What else can I do besides sue for malpractice?

Your first step could be to contact the profession who rendered the service. The professional may not be aware that there is a problem and that something needs to be done.

Most professionals are honest and diligent, although as they are still human they can make mistakes. Where the mistake can be corrected, many professionals who become aware of a problem take the necessary steps to provide a remedy -- without the need for any further action. Most professionals welcome the opportunity to make things right when given the chance -- this helps you obtain immediate relief and lets the professional correct the problem before any others are hurt.

State regulatory boards and licensing authorities also often regulate the practice of professionals rendering service within the state. A professional must comply with the regulations established by the state in order to initially be licensed and thereafter to continue to be able to render services within the state. As part of the regulation of professional practices, these state agencies or organizations typically have review and disciplinary functions. Penalties and fines -- as well as the suspension or revocation of authority to render services in the state -- can be imposed by state agencies and organizations

If you feel that a professional has committed malpractice, and you have been damaged, you should consult with an attorney. That can set the wheels in motion both to enable you to recover for the harm you were caused and to stop offending behavior by that and other professionals.