There is only one address for Mindpearl of which I am aware,
[email protected]. Also, you need only e-mail them your record locator, not the whole itinerary. They will check the PNR to see that it is correct, then send you cost and payment information and forms.
Also, check the exchange rate before you buy, make sure that you still want to buy in SA. AONE4 up nearly $1,000 from its low last week.