harrasment

I keep getting threatning phone calls about debt that is 8 years old and according to ombudsman it has prescribed .They refuse to tell me any information but want all my details for a upgrade \upgrade for what"They are rude always try to down talk you.When I asked for a CR number they insisted that it is none of my business therefore my details are non of there business.If they are desperate to obtain my details they should get a court order. """