Why charging so much for rejection fee and it not in the contract

Good morning

I am very unhappy due to your rejection fee that you have debit in my contract it states that you will be charging a rejection fee but there is no amount I mean how can you charge r202 for a rejection fee while my contract is for r239 that is so not right and when you send me an message to pay my account you never said anything about rejection fee and your statement is always late if I had known that you would do this to your clients blatantly expose us I would never had sign this contract this is so unfair you could have charged r100 0r less but r200 that is just a no no for me you are trying to make money out of your clients I would like to change my debit order to the 6 of every new month and I have send an email but it was to the wrong department as they only deal with 3rd parties please assist me.