MBD HARASSMENT

I have been receiving calls from MBD consultants regarding a certain "HERITAGE "account that I don't know. They claim that I took Reader's Digest from them. The last time I read or saw that book was about 33 years ago. I always explain myself to the consultants but it seems that they don't record our conversations as they would always claim. It's been almost four years now since they started harassing me on a daily basis. Sometimes they would call you about four times a day. When I checked with the Credit Bureau there's nowhere HERITAGE appears on my report. Please help me out so that I can stop the harassing calls. And in most cases their consultants are rude.