Ridiculous billing

I have been experiencing on going problems with the router regarding billing. I had initially signed on for a 10G anytime and 10G night surfer which would not cost me more that R400 per month. However, I have acquired bills over many thousands for data that I have not been utilizing fully. Content services were subscribed to without my permission nor my attention. I had placed a call limit in an attempt to control the over billing of an uncapped line. To my displeasure I have now found out that within the call centre, my contract my switched to a 20G opened line. I have been unable to receive the adequate help for the passed 8 months from any of the Vodacom staff nor the customer service lines. This has become a financial burden as well as an emotional one. I am thoroughly diappointed and dissatisfied.