Wrong debit order date

I changed my debit order date but kept on deducted on the wrong date leading to bank charges of R150 because of bounced debit order. Called the first time with the 3 transactions.they told me they only pay R80 bank charges but I told them that I was charged R150 for a mistake that was not mine. I sent the proof to them but there was no reply or payment done. Recalled again with the same issue after they deducted again for the 4th time and another R150 bank charges. Resent the proof.still no reply. Still no payment. I'm very upset and disappointed with thus company.i have been loyal for more than 20yrs