Vodacom is a ****

I took a contract phone with Vodacom and upon seeing that it was not what I think it is, I took it back within 7 days and asked that my contract be terminated. I was told that the first debit will go through but after I send them the slip I received from the courier company when they collect the phone, I will get a refund. The first debit went through and no communication from Vodacom until I reached out when I get a letter reflecting the next scheduled date for a second debit. I called and talked to Tshepo who was willing to assist except that he had no power to cancel my contract. He then told me that he sent an email to the relevant person and that he will update me. After a week, he told me he escalated to someone else. Then he kept quiet. The second debit went through. That means I am paying for something that is not with me or that I'm using. I reached out on email, Facebook,messenger, still nothing from Vodacom. Even Tshepo is no longer responding to my emails. I would like to know from Vodacom that how long am I going to pay for this or am I paying for a device that us being used by somebody else? I mean this has an impact on my credit status and no one seem to care. I will never buy any term Vodacom. I will even port my daughter's number to a different network. It sees like Vodacom is very quick to assist when you want a new contract or purchase something from them. When you have challenges,no one cares. I keep asking myself why they did not cancel the contract when they received the device because I received an sms saying the have received the device. I am reaching out here with the hope that I will get help.