Fnb debit order system

Good day I was ****med by a company nkp mobile they deducted 2900 from my account over two months. My bank of more then 20 years is stating that I have an agreement with this company. And I must contact them to stop the agreement. Which is true and I approved the debit. Hence they did not deliver any rooter nor the Sim. So they broke the agreement. How can you allow them to deduct more money when I am telling you that the agreement are not met. They say I can't stop it nor reverse it. I am in disbelief that you can say that this is something you never encountered. I called since last month for the company to stop this no answer no response. Yet they must take my money for 2 years as per agreement. FNB I even asked for assistance at your ***** department to no avail. Please help me. And lastly your debit order system must give us a reference after we stop this *****ster. I stop this debit numerous times on my app. I have no proof cause I have no reference to me doing it. Lastly I am asking as I maybe have to close my account to stop this R29.000 ordeal not happening to me.