Excessive data usage

On 26/9/ 2015 after landed in Mauritius from South Africa I switched on my phone and before going through passport control received 10 messages from Vodacom about data usages with an enormous amount of money charged on my account. Amount R 60 000 for data usage.<br> Firstly I do have a limit on my account and the limit was exceed and secondly I did not use any data at all. <br> I immediately tried to call customer care but did not succeed . We are a group of eight who all can testify that the messages was received during us disembarking the plane.<br> I then proceed by sms and notify the customer care number to open a ***** case.<br> I want an explanation as well as a detailed report about the data that was alledgedly used .