My 3 month's probation has passed and I was terminated without notice.
Is that wrongful dismissal?

Yes. You have been dismissed and you are owed severance. I would strongly encourage you to visit the severance pay calculator our firm has developed to see what you are owed (www.SeverancePayCalculator.com). I would also encourage you to call us and set up a free and confidential consultation with one of our employment lawyers who will further assess your matter.