What's the point of a company entering a contract with a union if the union refuses to abide by the terms they agreed to? The company agreed to higher rates, be

What's the point of a company entering a contract with a union if the union refuses to abide by the terms they agreed to? The company agreed to higher rates, better benefits, etc and gets nothing in return. It's a bad sign for anyone who might consider joining as well- all the benefits you think you get by joining a union or any sort of collective go out the window the moment it becomes inconvenient for the collective to back you. Next step: you're still disenfranchised, but you've traded the farmer for the pigs.