telephone etiquette

African Bank has the worst call centre agents ever!!! These people are rude, have no manners and don't even know the basic telephone etiquette. When telling them something they don't acknowledge you or if you ask them something they don't even ask you if they can put you on hold they just leave you hanging and call someone else to the phone. I have spoken to agents now twice within the last two days, I don't know why they have to call me a second time as I'm not interested in speaking to them twice once is good enough. I don't know why they keep calling me and I have no interest in talking to them because of their bad attitude. When you ask them to call you back they don't even acknowledge you and they never call you back when you tell them when you are available!!!