Most of the time, students want to know you are listening and will assist to address their needs. In most cases, their complaint can be quickly resolved without escalating to third party regulatory agencies which adds another level of review and inquiry.
It is critical to log all complaints and document the corrective or pending actions. Include details and investagate the complaint to determine if there is merit. Communicate with the person making the complaint without compromising confidentiality. Document...document...document.