Incorrect DATA bundle orders

I requested a once off 2G Data purchase yesterday 12/04/2015. It didn't clear and I was charged out of bundle rates. Then I requested another bundle purchase this morning 13/04/2015 and is still would not activate. I then phoned Vodacom who said that the 2x(2Gig) definitely weren't activated and it didn't appear on my account so they would activate a once-off 2Gig Data purchase for me. Now I have just received notification that 4 x (2Gig) data bundles have been activated!!! I have 8 Gigs of data which I did not purchase and am being billed for and when I phoned VOdacom they said this is not appearing on their system. Please amend ASAP I only needed 2 Gig once off Data please. REF: S3-8252L-L1G3T. THis is not the first time this has happened.