No answer to queries and bill inclining monthly

Bad bad bad. I have been with Vodacom for many years. This last few months my bill just inclined. I have bee charge for smart call and services which are not registered for. I checked all the numbers to check that my numbers are not register for entertainment services. I confirmed that they are not. I emailed Vodacom twice with no response. How can my i be charged for something i am not registered for. Why must i pay for services i did not register for. Vodacom owes me an explanation and refund. This is unacceptable. Should this not be resolved, i will cancel all contracts and move to another service provider.