Mfc staff are not allowed to disrespect customer's and attack them

I have been up and down with nedbank,about my account,for 2 years now,i informed them about my payment problems,they ignore me,except when they phone nd attack me iver the phone,so i am fed up and i gave a attitude regarding the people from Nedbank MFC phoning me,they refused to assist,when i tried now after being phoned about a week ago,no one phoned me back ,and to phone them ,you are sended from pillar to post ,waisting airtime,today a person phoned,and asked security questions,but attacked me fir being unemployed where am i getting the money to pay the payment im using,why am i attacked,i got angry ,im tired if these people saying no we wil not help you,then yes we xan but we font want to,why ,why,im tired of these stick up staff thinking i made a contract with them personally ,if management responded to my requests,and emails this problem would be sorted out now.u will attack back uf yiu attacked me verbally over the phone