Disappointed in Computicket!

Thoroughly disappointed as I am unable to purchase a flight ticket online without owning a credit card! I even phoned Checkers (as there is supposedly a Computicket service there as well), and when enquiring over the phone, I was told that I can only book a flight with SAA???!? So if I want to purchase a flight ticket with another carrier such as Emirates or Qatar, what am I now supposed to do as far as Computicket is concerned???!??? This is unacceptable! I am not opening a credit card just to book an Emirates flight (for example), on their website!!!