Incorrect Billing

When i woke up to connect to my router i got the shock of my life, it was displaying sms only so i logged in to it and checked my balance and i had no data. On saturday 9 may i had over 1.3gb of data and over 300mb of night data. I then logged into the vodacom site and my bill is now over a thousand rand instead of r119. My phone was connected to my router at night and i have an app that tracks data and only 2mb was used throughout the night. My phone is the only device that was connecte. And also i have set up the soft lock after r50 of usage. This just doesnt make sense. Why vodacom. why? This is not the first time this has happend, can you please look into this and bring my data back and fix my bill. Just when i was starting to warm up to this network, this happens.