Changing their promisses

I accidentally used my wrong SIM in my 3G ****le so I was billed out of bundle rates which calculated to about R4500. After speaking to the call center about the issue they called me back and said the mistake was on my side and there is noting they can do about it now BUT if I renew my contract, as it was at due for an upgrade, they can assist me by charging me in-bundle rates for the data I used and refund me the amount to my account. But I will have to renew or upgrade my contract. I called a few weeks later to check again if they can't charge me in-bundle rates without renewing the line but again I was told I have to renew.<br> <br> I was at the point of canceling this line as I don't really use it but decided to renew it to get my refund. The problem now is that I get a totally different story from the call center after I upgraded the line. They now say that there is no such thing that they can refund and charge me in-bundle rates for the data used. <br> <br> This is totally unprofessional and unacceptable to be **** at just so that they can renew my contract!!<br>