Harassing phone calls

My mother and I have been constantly harassed by this company using various numbers which we don’t know who is calling and leaving no messages so if these people can just stop calling for debt collection then everybody’s lives will go better. I’m reporting this telephonic harassment to a much higher department and hopefully an investigation will be done on them to see how bad this company really is. My family and I are living in fear because of all the harassing phone numbers we keep on getting and it is driving us crazy.