Vodacom blaming their mistakes on customers

Dear Vodacom, you sold me a wrong bundle and instead of correcting your mistake, your resolution was to blame me for using it. I bought a 1 day data bundle, you gave me a data bundle for an hour instead of the one I paid for. I used the bundle within the allocated time and now you don't want to correct your mistake. I'm not sure what you would have expected to happen, I would like to get the bundle I paid for or my money back. I look forward to getting the latter or the former.