Iphone data usage with pre-paid phone?

I just got an iphone and i have a telstra long life deal in which i have $30 worth of credit for 6 months (mainly use viber and what's app and my home Wi-Fi) but since yesterday it says i've used up $15.00 worth! What do I do? Never had a pre paid phone so don't know how this even works. HOW CAN I REDUCE DATA CONSUMPTION! #FreakingOut (that went into caps accidently but it helps emphasise how i feel i guess?) so yeah thats about it. I BEG YOU FOR Help lol

Telstra charges $2 per MB. That is a complete rip-off. I suggest you get a Virgin Mobile SIM that gives you 1GB.

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