For someone who already knows what you're quoting, what you said is understandable, though incorrect.
- Paroli means "to speak" (perform the act of talking). To say "to say" (express thoughts through words), you would use the word diri.
- Since Tony Montana was ordering / inviting someone else to say hello, you would want to use the imperative (-u ending) instead of the present tense (-as ending).
- Additionally, the accusative (-n ending) is not necessary after a preposition unless you are indicating movement/changing the object of the prepositional phrase from a location to a destination (for example, "on the tablo" = sur la tablo and "onto the table" = sur la tablon)