Bad call center service.

I booked a flight from East London to Johannesburg booking number VOV334 and forgot to ask for a wheelchair for my sister in law who had a knee replacement. I discovered my error when she arrived at the airport in East London and immediately tried to rectify it by calling Saffair I got the run around with the recorded messages, and eventually got an operator after almost an hour I got absolutely no help from her, and at timeshad to ask if she was still on the line, I could hear voices in the back ground, and eventually she hung up.. I always book with Saffair, but I am very disappointed in the way I was handled