NIGHTMARE - Buying Vodacom topup data

I have a data sim for my iPad. I often run out of data which means standing in L-O-N-G queues at Vodacom! Their website is either down or just hangs.

Anyone have an idea of how to topup data without this frustration?

I mailed Vodacom about 5 weeks back but to data, no response. Needless to say, THEY SUCK!

Never again Vodacom.