Bass & asso attempting to put my personal matters in the

I just received a call from Bass & Associates. They are really threatening me and harrassing me at my job and attempting to put my personal matters in the air to my supervisor. I have a payday loan that I am in the process of trying to pay off. But I wont pay these people because they are truly awful and inconsiderate of other people's feelings. I am ready to pay it off but I want it to go to the original lender. I need to know how I can report this company and have my work number blocked so that they can stop harassing me. I have never experienced this and they do not understand that people go through rough times in life and rude and inconsiderate people is not what we need. Please help i would really appreciate your advice and solutions to this problem. thank you. :(