I have worked playoffs and that has no bearing on what I would have done.
If i was 100% sure he did what you said he did he's gone. I dont care if its the championship game with .1 seconds on the clock and his team is UP by 1.
If I am not 100% sure his intentions its a T at the minimum. But this is unacceptable coach/official contact.
**disclaimer** if it were a she and she did that to slip her number in my pocket and she were cute - I might just let her off with a warning (I KID - I KID)