network issue

on Friday 6/11/2015 I had loaded 5r emergen y airtime from cellc and that afternoon I loaded R10 to pay it back. I got the sms confirming that I had paid for the emergency airtime. Saturday morning I loaded R10 again and the whole R10 was deducted and I got an sms saying that they thank me for paying I am still owing R6 I then called the call centre to query the issue and the lady I spoke to said that on the system it shows that I loaded 25r emergency airtime on friday which I did not I loaded 5r so then the lady checked my usage and it shows that I used 5 and not 25 so its clear that it is a system error. the line thenn went silebt and cut I called back and asked to speak to a teamleader they put me through to a Sihle who then said he will open a case and I should get an answer in two days and I still have not. yesterday I loaded R10 and the r6 was deducted again. I am very disapointed and it does not make sense what happned and I need my money back