poor services from mango airlines

My mum had flight from durban to joburg with mango on the 9 March 2018, there was adelay with the flight almost 2 hours. She arrived late in joburg and missed her international flight to Dubai. She has to pay R 5000 to rebook her flight to Dubai. The mango guest care call center just said sorry and nothing can be done and will not be refunding for any costs she endured. They not are very helpful or accomadating to the fact they are to blame for those costs that incured due to the lack of service. They also took long to answer the call,for guest care services that is not good at all. I was very disappointed with services from mango will definitely not be using this airline again.