Missed flight because of no announcement

I was supposed to fly from Cape Town to Joburg,to Abu Dhabi then onto Mos*** on 2 Dec 15.My connecting flight was at 9am in Joburg.The boarding gate lady pre-checked all passengers in but said plane was delayed.Later announced that plane would be delayed until 10:30am.Due to delays I went to Mug&Bean to sit & have a drink.No announcement regarding flight nor a call for my name-speakers not working!When I got to gate at 10:30,they had packed up & gate closed.Airports ACSA did not apologise or give any reason for the problem.My only real option was to fly back to CTN. I want to find out who is responsible for the speakers at the Mug & Bean cafe in the international section.Because of the speakers not working,my unplanned expenses consisted of R1275 for changing my Etihad flight,R3726.72 for a ticket back to CTN,R1241.72 for ticket to fly back to Joburg from CTN on 5 Dec,R1022.12 for staying in City Lodge for the night before flight out of Joburg.Expenses incurred did not include money for petrol that had to be used to pick me up & drop me at airport plus additional parking costs.I would like my expenses fully refunded & a full explanation why the speakers did not work from ACSA.