Incorrect billing and attitude

I started my uChoose Flexi 350 with my Samsung J1 in June 2015 and pay R309 every month, until a few months bills received were for R476.50. These bills showed charges of R86.84 for top up (not part of the mentioned package), R51.75 for BIS for Blackberry (I have a Samsung) etc. I contacted the call centre, had no luck with staff. I spoke to the Manager who advised that they had been charging me incorrectly and told me that if I had not reported it, they would have continued to pay this. I threatened them with reporting this to Hello Peter, to which the Manager rep**** \Go ahead