Of course, this didn't happen.
Megalodon sharks have been extinct for millions of years. And while large parts of our oceans remain unexplored, the chances of their survival are virtually nonexistent.
Only fragmentary remains, mostly teeth, have been found, and many aspects of their biology and behaviour remain unknown.
More about the Megalodon:
https://en.wikipedia.org/wiki/Megalodon
https://a-z-animals.com/animals/megalodon-shark/