Based on the information you have provided, it would seem that the voices are not automatic thoughts (in the context of cognitive behavioral therapy) or what is also known as an inner voice. They seem to be more characteristic of auditory hallucinations. There is more than one voice, they are unrecognizable, and are not something that you can control. They are also causing significant distress.
In the clinical world, hearing voices that do not come from the external world would most frequently be categorized as hallucinations. Hallucinations are associated with psychotic disorders such as schizophrenia and some medical disorders including seizures and migraines, but not everyone who experiences hallucinations is mentally ill or has a chronic disease. Oliver Sacks, (recently deceased) is a famous neurologist, who has written extensively about the nature of hallucinations. He observed that many people have hallucinations in the form of seeing and hearing things that are not there. He estimated that approximately 10% of people experience hallucinations but are not mentally ill.
The nature of your hallucinations and how to treat them should be thoroughly addressed with your mental health providers and your general practitioner. Medication or therapeutic techniques can decrease their distressing effect upon your life. You might also consider reading the book Hallucinations by Oliver Sacks. Another book that may be of interest to you is called The Voices Within: The History & Science of How We Talk To Ourselves by Charles Fernyhough. I wish you the best of luck. Please take care.
Dr. Kristina Randle