Outragous billing!!! No Invoices

I woke up to a shocking billing from Vodacom , with charges of 2 gigs of data purchases but no proof of purchases or confirmations of the data being received from my side (SMS confirmation) how my bill went from R600 odd to reaching its call limit R200 and over the call limit is beyond the man on the street. These outrageous data charges from both Vodacom and MTN frustrating and annoying not knowing how we are billed whether on 3G or LTE.