Delta Coaches left people stranded at Queenstown Shell garage over nighy

My little sister came for funeral this past weekend and booked return ticket from Cape town to East London, she was supposed to return today but bus never showed up at East London station, they were put in a greyhound bus that is going to joburg and advised they would be dropped off Queenstown and picked up by their Delta coaches bus from there and make their trip to Cape town, however her and 20 other passengers are stranded in Queenstown shell garage with no hope or communication, instead one of the Delta mechanics advised them that the only bus going to Cape town had already left earlier and was full and there wont be any other, he tried calling to assist but did not get anywhere and ended up leaving, im writing this with a sore heart as there is no care at all as theu have been stranded at the garage for more than 2 hours now and should she arrange a place to sleep and bus comes and leaves her she will struggle to get refund as is, even though fault is on the companies side... No arrangements or communication, they were just picked up from East london amd dropped of in Queenstown.