When a shop is not run by the manager

I upgraded at Brooklyn Vodacom, and the first issue is that I was placed under the impression that my previous contract would be expiring at the end of the month. I am now left paying for two phones, and the amount I am being charged makes no sense with regard to the quote I was given for the new contract. I also cannot go back and challenge the shop, as this risks more abuse from a manager who has no respect for women. Or maybe that's incorrect, because he seems to be afraid of challenging females on his staff. When I initially purchased the phone and accessories, I was sold a charger I didn't need, and the istore confirmed the new phone needed the same charger as my old phone. When I went to return the charger, the saleswoman met me outside the shop, claiming she "had just phoned me" but never said why she had done so, and this was puzzling as she had no idea I was returning the charger. When I produced the receipt, she demanded the "machine slip" and I told her I didn't need this to make a return, and she gave no further explanation and the money for the charger was credited to me later. The next week, she phoned me repeatedly, demanding that I provide proof that my payment for the accessories had gone through. When I finally tried to address this with the manager, I was interrupted, labelled as defensive, and told that he had "viewed my actions on camera". Congratulations, you invaded my privacy to confirm I paid, and your saleslady grabbed the machine and proclaimed the payment as correct. He also told me he saw no reason for his involvement, as the saleslady was doing such a wonderful job. When I later tried to complain through their head office, I got to hear "the shop had taken care of the payment" which they obviously wouldn't have done if I were a horrid, defensive ********. But if I now go back, I'm sure I'll get to hear I'm awful and the saleslady is just wonderful. I can only say be careful of the wonderful staff at Brooklyn Vodashop.