'I got misunderstood' is a correct sentence?
No. Instead you can say "I was misunderstood" or "I have been
misunderstood." Explanation: The word "got" is a conjugation of the
word "to have." To have something means that you own or possess it.
So it doesn't make sense to say "I own misunderstood." The word
"was" is a past tense conjugation of the word "to be," and it does
make sense to "be misunderstood." The same goes for the phrase
"have been".