Being ********** again by Vodacom.

I have been trying to stop paying my monthly debit order for my Fiber line. My request has been loaded twice and twice they have failed to correct the mistake of charging me double the price for a single line. How is it possible for these giant telecom companies to continue ripping us off and nothing is done about it. There seems no way to stop them. They are alaw unto themselves. The specialise in riping off the less fortunate in society. Please learn from my experience and avoid Vodacom