Not accommodating in schedule change by SAA

My sons flight in Perth was delayed due to another airline have to do a emergency medical landing at another Airoport - he and other passengers where stranded for two days with no assistance from SAA on getting them home. When contacting Gotogate to please schedule him for another date so that he doesn't spend another day at the Airoport not knowing when to get on a flight, they wanted to charge me and informed me that SAA are the ones to change another return day. sAA says the travel agent we used should that - gotogate not helpful at all saying only SAA can help, how can they help when no one at SAA doesn't help at all - No wonder SAA is going down