Upgrade on same Package, 6-8 Gig been billed

I upgrade on same package, but after upgrade my monthly bill went from R750 to July R4350, August R3450 and Now September R3400, their excuse: I USE TO MUCH DATA ...I'm apparently using 6-8 gig a month ????<br> Lodge complaint at branch, Vodacom must investigate why I USE 6-8 GIG!!! Will I get Refunded ...the answer : Vodacom must Investigate why I use 6-8 GIG!!! My Dispute Ref is S3-8IH1F-FP6I1<br> <br> Let's see, because last month They toll me I must switch all data of my phone, and just switch data on when I use it....I did not even Used It, what ' s the use of having a smart phone and not using it!!!!! I've been having a smart phone for the past 6 years. The problem started when I upgraded!!!!!!<br> <br> Let Hope I'm a valued client and they help me resolve the issue \Vodacom needs to Investigate why I sue 6-8 gig a Month"although before my upgrade I only use Max 2gig """