subscription

I reported my 3g missing in March, and requested that it shouldn't be suspended as it shares a line with my iPad. Normally I pay a subscription of R109 and get 2g, my bill end of April was +-R5000, end of May +-R6000, I have queried this with them but they say there is nothing they can do because the line was active. My question is, why is my bill so high after reporting that my 3g is missing and requesting it not to be suspended. <br> Pls help me get to the bottom of this.