Bring Back my money please

I contacted vodacom to request a quote to cancel my account prematurely . Made a payment and sent proof of payment to the email address on the document. This was on 22nd may , my payment date is the 1st of each month. 1st of June my contract was supposed to be cancelled. Come 1st of July you guys debit me R2844 on top of the R2400 paid to settle my account ? when I call someone says my account was cancelled 3rd june so I was charged another installment for June now they wana refund me R2400 because they want to minus the June installment which was a result of someone not actioning my request on time. I honestly feel disappointed with vodacom, I have made over 20 calls to get my money back with no luck . How do i escalate this to the CEO because you cant debit someone else's money and give them a runaround when it comes to giving them all the money they paid back . This vodacom account is now reflecting in arrears on my account ? this is what we get for being loyal customers to vodacom for years when we decide to close accounts? With all due respect, can I please have my money back I beg please @vodacom ***