Disrespectful ,racial staff

I've received a phone call between 07:35 and 07:45 from Standard bank collections ,they phoned with a recording ,and drop the phone when I pick up ,this has been happening for a while now ,I phoned back at about 07:46 +- the person I'm talking too is buddy joking and laughing with another male colleague while talking to me on the phone ,disrespecting me ,I don't even know if they where joking about me ,I've been trying to get help from standard bank regarding my home loan that's in arrears ,and they are charging me between R400 as and R600 interest every time I receive a message from them ,I talk to different people, and not one follow up or finalize the problem or help me I still owe to this money ,I can't pay it I've explained,and explained ,now staff are rude ,by making jokes about me as a customer on the phone ,and when I tried asking a question the line are dropped ,do they think this is funny ,now I will not answer you're phone calls .anymore ,maybe I must open a racial case ,against these 2 staff members.