Money owing to me

I app**** for a new line at a vodocom ship in fourways . Once it was approved they didn't have the phone that I wanted so I had to look for the phone and I found it in the second vodacom shop in fourways mall . They said I had to cancel my contract with the first shop in order for them to issue me with the new contract and the phone . I called them and my contract was canceled 2 days later . Then the new shop told me that vodacom is looking for a upfront payment of R5000 or I have to submit all my documents again . So I did submit and it was approved with no upfront payment. Once I got the phone I got a sms saying I owe vodacom R6000 and they will deduct on the first. I called vodacome so many times and no one can help me with this issue as they all say that someone is busy with it . I'm sure they will take the money from my account and if they do I will open a case for ***** and theft against them and I will publish this complaint in every social media . I have school fees to pay and I can't have my account in arrears becouse of the mistake that vodacom made . Can someone please sort this out asap