Super rude gut named William called for my boss bu...

Super rude gut named William called for my boss but was very rude to me and hostile. Don't have time to spare the details but to make a long story short. I was not the right person to pay for some bill the company owes, yet I was being targeted and called rude. Needless to say, I hang up on him and refused to answer the phone when he called back. Everytime he has called he sounds annoyed or angry and not very pleasant in his communication.