Vodacom auto forfeits data

<p>On the 1st of may,the 8th of may and 15th of may,last 3 Mondays in a row,my vodacom prepaid data and airtime has dissapeared at midnight.despite loading a gig of data the day before.last night I spent 45 minutes on the customer care line,after being told I don't load enough data the consultant (a Mr Phendulo-very helpful)finally acknowledged that the system had wrongly expired my data AND airtime.he then credited my account for the amount of the 1 gig,and apologised.but what about the previous 2 weeks?that's 2 gig of data that is just missing(expired/forfeited after less than 24 hours).does vodacom zero all accounts on a Monday?we pay through our nose for that and then just have to accept it?</p>