We definitely did something. It just would have been a lot worse if we didn't. In fact so bad that BBC says the planet would have been "uninhabitable."

According to some models, the Montreal Protocol and its amendments have helped prevent up to two million cases of skin cancer yearly and avoided millions of cataract cases worldwide.

Had the world not banned CFCs, we would now find ourselves nearing massive ozone depletion. "By 2050, it's pretty well-established we would have had ozone hole-like conditions over the whole planet, and the planet would have become uninhabitable," says Solomon.

https://www.bbc.com/future/article/20220321-what-happened-to-the-worlds-ozone-hole

That's not true at all.

In 2019, abnormal weather patterns in the upper atmosphere over Antarctica dramatically limited ozone depletion, leading to the smallest hole since 1982. Models predict that the Antarctic ozone layer will mostly recover by 2040. - Source