Dis-pleased

Rain had erroneously debited my account with an amount that I had not agreed to, I called Rain and queried the debit, after a along telephone call, they said the will reimburse the funds but never did , so I went to my bank CAPITEC asking them to dispute the amount and I proved to them by submitting statements that Rain should have not debited my account with the amount that they did, I thought that my bank would make my satisfaction their priority and do what I asked them, since this was my money and they are my bank ( that I thought I could trust) instead they told me they can not dispute without strong evidence!! On the 31st rain debited my account again with the same amount, I don't know what to do...