How do I stop Megalodon from going extinct?

A long time ago, the 60 foot long Megalodon roamed the oceans. Fast forward to 2.6 million years ago and they went extinct. In the story I'm writing Megalodon hasn't gone extinct surviving at least up to the late middle ages.

Now the question I want to ask is: what has to happen, or to not happen, to prevent Megalodon from going extinct, preferably without radically changing the ocean's ecology?

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How do I stop Megalodon from going extinct?

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