Occasionally, fortunately rarely, when chasing slow payers (it’s a very sensitive matter), you’ll come across someone who’s rude, abusive even. Most times, it’s not YOU they’re angry at, it’s the situation or something totally nothing-to-do with the account OR they’re just nasty people!
This short story might help you deal with it.
Buddha was well known for his ability to respond to evil with good. There was a man who knew about his reputation and he traveled miles and miles and miles to test Buddha. When he arrived and stood before Buddha, he verbally abused him constantly, he insulted him, he challenged him, he did everything he could to offend Buddha.
Buddha was unmoved, he simply turned to the man and said, “May I ask you a question?” The man responded with “Well, what?” Buddha said, “If someone offers you a gift and you decline to accept it to whom then does it belong?” The man said, “Then it belongs to the person who offered it” Buddha smiled, “That is correct. So if I decline to accept your abuse does it not then still belong to you?” The man was speechless and walked away.