Dishonest dealings and unwanted changes

During the FlySafAir R1 flights promotion it took me five hours to book one flight for My Wife and I and our 2 year old daughter (and it cost R840 in the end which was still cheap) on 25/08/2015 booking ref DZYDG8, however I then received three SMS messages on 02/10/2015 more than a month later informing me my flight departure will no longer be 08:40 as per my booking, what I paid for and what was confirmed via email to departing at 20