Complaint horrible service received

Hi there I would to complain about the horrible service I received from RCS-CTM store card I am in a process of closing my card paid the settlement amount and requested a paid up letter and closure of my account instead of me getting the letter I am requested to submit my bank statement and refund forms for an error that was created by them after talking to many consultants (Cherlton van wyk, Siziwe and Mcumisa Zondo) explaining that I did not make a duplicate payment errors is on their side and refused to hear me instead insist that I send them details instead of sorting it from there side.

I requested Cherlton van wyk to put me through to his supervisor and he refused and the first time I dealt with him he place my call on hold pretending he can't hear me.