Depends on the version of the key you have - do you have the mechanical code so you can get a blade cut ?
Below advice is from a post by Cromwell, not sure re locksmiths in South Africa
Code 2 156 & 166 1997-2001
The chips in these keys cant be copied. To make keys then a good Locksmith will remove the code box. Read the 93c56 eeprom (Memory chip) in it and generate the keys from it.
Code 3 156
The chips in these keys can be copied by many high street key cutters. It contains a Phillips Hitag2 chip. Generally referred to as an id46 chip.
If you have lost all the keys for one of these then you are stuck ordering a key from the dealer or getting second hand keys with a matching ecu and code box. The code box on these uses an ST Micro controller that cannot be read safely.