Data issues. AGAIN!!!

I purchased 1GIG of Data 8AM Sunday 13th Sept. I checked my balance at 1PM the data was at +950MB. I was NOT surfing excessively, in fact i used my wifi when possible. Late that evening whilst ASLEEP i received a msg that my call limit (R50) was reached, upon calling customer care, they had informed me that i had gone over my call limit and is at R850 and that i in fact still had a data bundle. <br> <br> o i did NOT use 2gigs yesterday as per the customer care had said.<br> o i did NOT receive a notification that my data bundle had depleted. <br> oCustomer care had said \Vodacom cannot send a data notification to the cell number in use"<br> o my call limit is now over R1300"