Making cancellation of debit order impossible

My daughter agreed to have her bank account debited for an old friend’s contract but getting you to cancel the debit order has been impossible. She has been into various cell c stores almost every month since November 2016 but refused help every time because she is not the contract holder. She explained that she was being debited for someone else’s contract and wanted to cancel the debit order but was told she must bring her old friend in with her to cancel the debit order because the contract is not in her name. This is totally unacceptable and *******, the contract was not in her name but she has full authority to cancel and debit order from her account. We have tried to explain this to your so called “customer service” staff but besides being arrogant, unreasonable and very unhelpful they could not grasp our dilemma. I was then told they had changed the contract to a cash payment so my daughter won’t get debited again. Another lie because they debited her account again last week. Cell c, you don’t deserve a C, you should have an F....