Vodacom charging for data that was paid for.

I have bought 30GB of data from vodacom on their black friday promotion. This was loaded later after an error occurred. This was on top up contract sim card that is paid for by my husband. Now they loaded another 30GB that I never requested and charged over R400 for data that was initially paid for. We tried to contact them but each time they will disconnect the call when they are supposed to resolve the problem. Please note that the contract is top up so there is no way we can just add 30GB without paying for it. We took top up so we can manage how much data we use but that doesn't happen at all