Unhappy New Client

I am a new client, when I collected my phones I was told that I will be debited within 24-48hrs for the pro-rata amount. After more than that I called Vodacom and was told to either pay in store or change my debit order date. I then opted to pay in the store. A few days after I have made my payment you debited my account and I reversed the debit order now I'm being changed a penalty of R201. No man. This is not fair and leaves me with an unpleasant feeling. This is the first time I have a contract in the past 10 years and opted to go with Vodacom please don't let me regret it.