cell c does not care about their customers

i have sent cell c an email on may the 14th and asked to have my 2 contracts debited on separate dates . the one is supposed to go off on the 15th and the other on the 30th . previously i have also called the call center about 2 months ago and asked them to do it for me and nothing has been done since . i also wanted to know why am i being debited R548 when i am only supposed to be paying R469 as my one contract is R200 and the other is R269 . after i have sent the email i received an email to say cellc will be in touch with me in 5 business days yet it has been 9 business days and i have still not received any email from cellc . i again sent cell c an email 5 days ago but i have not received any reply from cell c