Still getting billed on old account details!

As I were not working in SA at the time and had no other means of contacting Cell C, but through their online response form, I sent them a message that my debit order details has to be changed. However I did not get any feedback from them, and 2 weeks later my old account has yet again been sent a debit order request, which in turn lead to me paying penalty fees for insufficient funds being in my old account which I don't use anymore!<br> <br> I'd like to know if Cell C will be paying back the penalty fees I incurred for the debit orders that are ran in an account with no funds!!!<br> <br> Why is there an online contact form, if nobody contacts you back??!!