This is not problem-solving, but tantrums are one way of doing things. Negotiation is another way. This preserves business relationships, rather than rupturing them. It avoids scary increases in your blood pressure. Nevertheless, for many people, negotiation is a mystery.
Most people never negotiate.
You don't walk into a department store and bargain over the price of a shirt. You read the tag and you pay the price. Still, negotiation is worth knowing about. Good negotiators follow just a few rules, and they make lots of use of a magic word. Usually, the rules and the magic word work fine.