Cell C won't fix its own mistake

My frustration levels with Cell C are extremely high as they have no inclination to solve my problem. I took a package two months ago that included 1000 free wifi calling minutes. The branch did not activate this feature on the VAS (value added system) so I have been charged for these minutes the last two months. I have been into the branch 3 times to try reciify it but their hands are tied despite trying their best. The fix has to be done by head office but on the phone head office just keeps blaming the branch but don't sort the problem - it's a package they offered yet keep pointing fingers - no rocket science there. The branch has tried its best but has to email the problem to head office to rectify but they just do nothing. No response to emails and no solution for me- and I keep getting charged for usage I should not be charged for. I have not even pursued trying to get a refund yet. That will take another few months. Cell C simply has no respect for its clients or their time.