Suddenly without my concent almost doubled my installment and cancelled my data

I had an upgrade a few months ago. Suddenly my debit order has jumped from R 300 to almost R 500 and my data cancelled. No changes was made to my package it was just an upgrade. The consultant told me only an extra R 100 would be deducted once off the following month because I was a month early and that's it. Now my installment has almost doubled and all my data suddenly cancelled a few months later. What's going on here?