Does the voice use your full name, including middle name? Is it audible to others, or only you? Auditory hallucinations occur in people with mental disorders and certain physical disorders. Stress can induce a brief period of such, but repeated auditory hallucinations should be an indication that something is not right in Denmark. I advise a consult with a physician or psychologist, especially of there are other symptoms.
There are beings called The Fallen Angels that took the leap with Satan to Earth. They are amongst us in the spirit world. They are not for your good they are here to torment us. If you continually hear these voices I would say find a pastor of a church that believes in what I am telling you, preferably a Pentecostal church.