Debt collector for a debt not mine, but for my employer. I told them that I am an employee of the company and that this is my personal cell number, please do not call this number. He started yelling at me and threatening me that he would start calling this number all day and night. I hung up the phone and he immediately called back spoofing a phone number of a person in my contact list. When I picked up he started yelling at me for blocking his number and that he was going to start calling my family members. I told him that I am an employee only and I was hanging up the phone. He immediately spoofed a family members number and called me back. I did not answer and put my phone on silent. He was very threatening and unprofessional.