Cell C has done it again!

I called Cell C on the 30th January 2015 to confirm the change of my bank account as it was in December 2014. The lady that was assisting me confirmed that at has been changed but the debit a order is the 28th of the month and I told her that it has always been the last day of every month . She asked me to hold on to correct the right date of the debit and then confirmed that the debit order will go through on the 31st. Then on the 5th of February 2015 I got an sms saying that I have arrears of R149.00 and what amuses me is that I had funds available in my account by the time I called to confirm the change of my banking details . I called again on the 6 February Im still being told that I have insufficient funds where as they are funds available my account still today. Im actually so angry and not happy with Cell C service, it is so unprofessional of them and I have been with Service Provider for more than 5 years now but they keep on disappointing me. I have decided to end my contract with Cell C after it expires to avoid more lack of professionalism and good service.