I think my Wise Chat was hacked?

First of all, I took my Wise Chat Pro down, so you won’t see anything when you go to the link above.

I saw a notification that I had left the chat but I saw my name on the list and wanted to know if I was really still there so I asked the other user – Anonymous3 – “Hi, Anonymous3, how is your Monday going” but in the chat window it appeared as though Anon3 was the one who had written it. I had no admin control, couldn’t kick or ban. Then s/he left. The first thing I did was remove my Wise Chat short code from the page. Then I changed my setting to no longer allow anonymous users. Here are my questions:

1 – is not allowing anonymous users enough to keep this from happening again?
2 – will I need to completely delete my original channel and start a new one?
3 – if I don’t allow anon users, will my friends/family who don’t have a WP account still be able to use my chat?
4 – a hacker taking over admin privileges to the chat doesn’t mean that s/he also took over anything else with the plug-in, I’m assuming? Please correct me if I am wrong.

It is interesting that, in reading through the last year+ of posts to this forum nobody else has reported the same thing, so I’m guessing this doesn’t happen often.

I use the Pro version which I only just bought a few days ago after using the free version successfully for several weeks, if that makes any difference?

Thank you for any light you can shed for me on this!

The page I need help with: [log in to see the link]