Bad service

I have just had a bad experience with telkom when it comes to deducting from my account. I had changed my debit order date to the 25th of every nonth as that is when my salary comes into my account, be it the weekend or not it comes in on the 25th exactly. Telkom decided that it should deduct money on the 23rd, which firstly is not what we had agreed upon and then I must get charged a fee for an unprocessed debit order for their mess up. I then sent the customer care an email as to why should I be paying for their fault still I have not been answered. In all honesty I want my money back because it makes no sense for you to deduct on the wrong date then make someone else pay for it