Customer Consultant with bad attitude

I noticed today that a company I had a contract with is still debiting my account, I have settled that loan 3 months ago, I called FNB to ask them to assist me in reversing the debit orders while I deal with that other company and to my surprise the guy I spoke to by the name of David told me straight that FNB cannot assist me with this as my bank and I need to speak to the 3rd party, he does this with attitude and when I asked to speak to the supervisor he gave me more attitude and then the call got cut off, I pray and hope that he did not cut the call and that this was some sort of a connectivity issue with that said he did not even bother calling me back. I would like someone to let me know if does FNB NOT assist with reversing debit orders anymore and if so why not because as client I would assume my bank would be able to help me in these instances. I AM SHOCKED in how this whole query was handled.