Not Happy with My Service Provider

I have been a client of Vodacom for 20 years. In 2013, I was hugely disgruntled due to exorbitant billing prices on data usage. This was sorted out and I started purchasing extra data bundles on a month to month basis and my billing was in control. Last year in November, I called in to purchase a data bundle and the man I spoke to sold me a recurring monthly data bundle and he assured me that I would not have to call in every month. He told me that it was activated and I had nothing to worry about. Unfortunately, I have not checked my statements for this year and decided to check last month. It turns out, that this month to month data bundle was never activated and I had been under the impression that I had nothing to worry about but I have being paying out of data bundle rates for the last year. I want Vodacom to retrieve the call I made in November and reimburse me for the out of data rates that I have been paying for the last 10 months. This is absolutely unacceptable service and my bill for October is over R3 000. I am definitely looking at changing service providers. Clearly, Vodacom is only interested in making money and not looking after their clients.