Vodacom systems can't rectify a human error

Ay my office we registered three data cards on My Vodacom, which we buy prepaid data for these cards. We use these cards for my staff if they visit clients. Our office closed on 15/12/2015 and I took one of the data cards with me to use at my holiday home - no wi-fi! On 16/12/2015 I went on My Vodacom to buy 3 gig of data - unfortunately I used the wrong data card number. Now I have 3 gigs of data on a data card that nobody will use during the next month. It was an unfortunate human error and I phoned the call centre to transfer the 3 gig of data to the card that I currently use. According to the operator at the call centre, it is not possible to transfer data between data cards that is registered under one profile on my Vodacom. I can't believe that, because anybody can make a stupid mistake, and it can't be the first time time that Vodacom receive a request like this!<br> <br> Please help a small businessman against one of the big businesses!