Problem switching from red bull mobile to cell c

My wife and myself both had contracts with Red bull mobile (cell c). Red bull mobile is now cell c. The first problem came when we upgraded our handsets and were told that red bull no longer exists and we have to switch to cell c which was fine with us. The switch was apparently done and we were billed extra for the month (pro rata). That was in march when we upgraded then when our contracts came to an end in july we started having trouble when trying to load extra data bundles via sms and via the call centre they said it was giving an error and they would send the query to the back office and call us in 2 hours. (No call). After a week i called back to check because i had run out of data and i need it to do my job, they still could not load data for me and i had to pay R1per mb for the remainder of the month. All they could tell me to do was switch it off if i dont want extra charges. Our contracts fees are R229 per month. Our bills now are R550 and R470 (apparently more pro rata charges) and apparently they have activated us again on red bull mobile and also activated us on straight up 200. When we call there is no feedback, Please give us some feedback? Bills are due on the 28th