Frustrating International Roaming packages

The International roaming packages are a pain! They are very useful, in that you don't need to put another SIM into your phone and can still get your SMS's (critical in case of a SIMS Swop) But you don't have ANY control over the purchase of the bundles. I recently travelled to Saudi Arabia, and purchase a bundle for R199 which worked well, but then Vodacom loaded the same bundle - I didn't need the minutes I just needed to buy more data. So I turned the automatic purchases off and then when I checked I had used R380 in 'out of bundle' data. I then bought a 5Gb data bundle and knew it will last till I leave. On the night of my departure on the way to the airport (with 1.1Gb left of my bundle) I get an SMS saying I have been 'allocated 5 GB of Data' So my roaming cost me a lot more than I budgeted for. Please Vodacom, give us some control over this process - at least let the system ask if I want another bundle and which one. Let's cut the frustration - it's a good system, but we need to have control over it.