warning: problem with adware

I activated this theme and directly had a problem with adware. Every time the site is opened with a clean cache/browser history, an add pops up and can only be accepted. No clicking away.
Bij removing the theme i was shown a screen with the dutch words: Vals aan het spelen?
In English: Are you cheating?

I don’t like this at all.
Only thing I could do is remove the complete site and start all over….