SAA Worst Airline Ever

I phone the SAA callcentre on Friday,the 13th of march, to change an already booked flight. The lady at the callcentre said she made the booking change, but the system is slow and I have to phone back on Saturday, the 14th of March, to ***e payment for cost of changing the details of the trip. I phoned back on saturday as per their request only to be told the booking was not changed and if i required a change i would need to go to the airport and the call was cut. Everytime I call the callcentre now the cut me off as soon as I give them my booking reference. I think this is shocking service. I will never use SAA again.