Cell C Customer service is bad

i am disgusted with the service i received from both store and customer care at clee c when i was trying to make a swim swap as my card is damaged. at the shop they asked for 5 numbers when i gave the numbers only 4 were accepted but the other numbers i did phoned as well i bought un ricard sim card and left the shop as i was advised to phone the customer care when i did that i was told i failed the security checks people come on i answered the questions when i sked the lady to elaborate on the last question in isizulu maybe i don't understand the english she refused and said she wont be able to assist me i must phone again but i have chosen option on prefered languages that i need to to be assisted with. i am still without a sim card. Please help.