********** sale and now I am suffering

In November I received a call from Vodacom offering me an upgrade on my package from a SmartS to a SmartL at NO extra cost, in fact at a cheaper cost. So I was upgraded for the 1st of December and to my surprise at the end of December I was debited almost R1300 for the contract. I have called in a few times asking for this to be rectified, for the sales call to be listened to- still nothing! In fact the ticket was closed without being resolved. I called again and the only agent doing her job, tells me that the person dealing with the query, STILL has not responded to her email. Now in my experience, if you tell a client you will give them something at a specific rate, you need to stick to your word whether you were wrong or right. I want my money to be refunded, this issue to be resolved and the sales person reprimanded for lying to me. I will log a complaint on all social network platforms every day until this matter is resolved. Vodacom, you guys are slacking, your staff needs to be trained properly and they should be given the tools to take ownership of an issue and get it resolved. It is absolute nonsense that I have to call in all the time to make sure my query is being attended too, which in fact it is not.