Incorrect Invoice

I called the Telkom Mobile call centre with regards to the incorrect invoice I received. I was refereedoing to Hello Peter by their consultant because they didn't have a complaints department. I took a contract and made it very clear that my account muts be debited on the 25th, however this month they debited on the 24th resulting in an unpaid bed it order. I e just been advised that I have to pay R200 for a payment to rejection fee, which I don't understand why as I instructed them to debit on the 25th. I have already been charged by my bank for an unpaid debit order and now I'm being charged by Telekom too. Telkom always debits my account on the 26th day of the month. I fail to understand why they debited early in November and expect me to lay for their mistake. This is unacceptable. I've been a loyal customer for almost 4 years and have never experienced such pathetic service. I can't wait for my contract to come to an end.I want this to be resolved ASAP.