I'm on Voda 79c. I had 51mb remaining of a 100mb once off data bundle which was going to expire on 6/09. Last recharge Vodacom sent me a promo sms offering free 50mb extra data if I purchased a 100mb once off bundle on 4/09. I purchased that 100mb bundle and got the 50mb free, but the 51mb remaining from the previous bundle has had its expiry shifted to the same 3/10 as the new bundle. Question is: Are Voda data bundles stackable allowing for increasing the validity by buying a new 30 day bundle when still inside a previous bundles 30day window?