I hate cellc soooooo much please help me deal with them

was incorrectly billed by cellc the agent put through a R100 deal on my account when I didn't not take up anything and all calls are recorded ,when I called to complain on the 15/12 they opened a case and said it takes 3 working days for a response, today is the 29/12 I haven't recieved a response ,I called 140 customer service 5 times and when the agents heard its a billing query they cut the call on me ,they was of no help they was rude and couldnt care less for the stress I'm going through, I hate cellc so much words can't explain, I pray hello peter will help me because they so unfair to they loyal customers . my debit goes of on 31st I told the agent I won't pay because they haven't assisted me yet she was so rude and said she will cut of my line ...please help me deal with them