Over debiting my account

<p>I phoned vodacom and cancelled my one contract and changed my other contract to a lesser rate as I did not need an upgrade on a new phone. The very next month the took off the same amount yet again. I phoned them back on the 11 of November 2016 while I was traveling from JHB to Durban, it took about 3 hours. They told me they did not know why the contracts had not been cancelled and changed. They did not debit me the next month however this month they debited me twice again. After aguing with the Agent for yet another 3 hours of time we get to know conclusion she insists what they did is correct</p>