No reply to data problem, except to disconnect me!

2 weeks ago i reported Vodacom for suspending my service while i was overseas. My Brother in S Africa called Vodacom who assured him my service was fine. When i returned on Saturday sure enough I found i was suspended. On Sunday when I called Vodacom about the suspension, they said they see no reason why i should be suspended and unlocked my SIM. My previous complaint led to the disconnection, but the complaint itself has not been addressed apart from a meaningless mail saying they are looking into it. Specifically my complaint is that i am being charged R34000 for 905Mb of data usage in Mauritius (according to the log on my phone). Before anyone says roaming data is expensive - i know this and have used roaming data in Australia and UK in the past 3 months. It is more expensive, i accept that. However, the charges are surely incorrect. I used data for a very short while and the Vodacom welcome message said nothing about data costs. I would like someone knowledgeable on data roaming to discuss this issue with me and please don't send me an email that says you are looking into it and then no follow up for 2 weeks.