Data bundle depletion & Expiry

My Flexi contract has an add on 1gig Data Bundle. I have data, 192.05mb, from the previous month which will expire 10/11/2015. The 1gig data bundle is being used up first without the previous months data being depleted first. <br> Customer care tells me sorry but that is how the process works. This is a flawed system whereby Vodacom scores if data is not used before the month end with remaining data expiring due to a badly designed system. This needs to be investigated....how many people lose data like this, its ridiculous 200mb here 100mb there, this amounts up especially at the cost we pay for this data. This seems to be an ongoing issue with Vodacom as I have had to escalate data bundle issues now for the third time in less than a month. If it hadn't been for the fact that I now monitor my data records daily I would not have seen that the issue has been from their side and not because of my Smartphone supposedly using copious amounts of data.<br> Vodacom you need to check your systems really.