No family Christmas for 92 year old lady

<p>On 14 December I booked flights for my mother and 92yr old grandmother, And phoned to arrange assisted boarding. I was told to call back the next day to confirm the service. After numerous occasions of being told to call back, I finally got told yesterday-19 December, that there are no wheelchairs available. I asked why I wasn't told this earlier so I could make alternative arrangements, to which I got a ridiculous answer. I could change the flight, for a day earlier(today-20 December ) , pay an extra R870 , but I will only know if there is assisted boarding 3hrs before the flight departs! Considering my grandmother has to travel 1hr 30mins to get to the airport, to potentially not board the flight, this is unacceptable and truly ********** service. I'm really sad, as she was really excited to fly to lanseria for a family Christmas that might be her last. </p>