Punish the customer for their errors

I am on contract but mistakenly bought 6GB data via Vodapay by (which I was meant to purchase for my partner who is on prepaid). I called in (Tobi is useless!!), spoke to a customer care lady who told me they could not reverse the transaction nor remove and transfer the data to my partner from my account. It can only be done prepaid to prepaid or contract to contract. How is this possible in today's climate with the technology available to us that Vodacom cannot reverse or accommodate a transaction to rectify an error. So poor honestly! I'm now stuck with data I'll probably not require whilst my partner still has nothing. We are bound and forced now to just live with this situation because Vodacom has poor systems and customer service. Be careful people.