Most regular banks outside the airport will only change foreign currency for their own customers so you will probably be forced to use a money changer.
Iningi lamabhange ajwayelekile angaphandle kwesikhumulo sezindiza lizoguqula kuphela imali yakwamanye amazwe libe ngamakhasimende abo ukuze uzophoqeleka ukusebenzisa umshintshi wemali.