I have used Sams on two occasions for Airport pick up.
On both occasions I have come in from Hong Kong.
After I made the first reservation because I had an international number they sent me a text to make sure I could receive it and they could communicate with me.
They were on time on both occasions , had bottled water in the car and had no trouble finding my destination in Sun City.
The rate was very reasonable also.
I would recommend them to anyone needing pickup from the Airport.