Bad customer service

I heve had a double deduction with payflex on 30 June. I have ever since been trying to get a refund on all platforms on payflex but no response. I then chatted to an agent at FNB and she advised that there is no way to reverse it I need to speak to the merchant. So now another deduction goes off. I log another dispute with FNB. I ask her how do I stop further sections from going off, she tells me there is no way of doing that. I then tell her if that’s the case what’s the point of me even chatting to her. So which means that when a deduction goes off the basically they can just keep deducting and there is nothing I can do about it. After I tell her I am going to hello Peter she then advised I should cancel the card and no further deduction can be made. So now not only did I receive bad customer service but also have to pay for a new card. I ask how long will the dispute feedback take? She says 7-14 days, by that time another debit would’ve gone off. FNB needs to do better!