Broadacres Flight Centre: Failure to list my toddler as a passenger on a flight.

We have booked numerous flights and holidays with Flight Centre. We booked our holiday package to Zanzibar and when we arrived at the Lanseria found that our toddler was not on the flight manifest. Upon return to SA we spent HOURS in the check in line at the rundown Zanzibar airport trying to get our sons name on the manifest. It was no joke having everyone check in while we're still waiting not knowing if we will be able to board plus dealing with my 19 month old screaming and performing wanting to eat while I have to wait at a desk trying to call Flight Centre and deal with millions of airport staff who are not helpful.There was another lady with three small children who booked with Flight Centre too with the same problem. It was horrific and a nightmare dealing with no aircon, a screaming toddler, sweating, dirty airport, ****roaches, cobwebs, exposed wires etc. Someone at Flight Centre failed to ensure my toddlers name was on the manifest and caused us such a huge drama especially at the Zanzibar airport. Furthermore I have asked Mongezi who booked the holiday for us at the Broadacres branch via numerous and detailed emails, calls and messages to investigate and advise me of what happened and he has failed to revert to me even once and it has been almost 9 months since our holiday ended. This is unprofessional and unacceptable.