Flight cancellation without notice

When I went to the bag check-in desk to check in my bags I was told that my 13:10 flight was cancelled and that my husband and I could only get another flight again at 16:40. Without any communication from mango in advance, not even an apology was offered, we had to sit at the airport for that duration and make so many additional arrangements. I think that this is so unprofessional and unacceptable, there was no form of communication, not even a R1,50 sms sent out? And the staff at the Mango service/information desk was rude and completely unhelpful.