Unauthorised and ******** deduction on debit orde

On 26 October 2015 CSS Tactical carried out repairs to faulty remotes.<br> The Job card amount was R310 which I paid in full on the same day and proof of payment was forwarded to CSS by email.<br> On 30 October I received an invoice from CSS for R310 by email. I immediately rep**** by emailing another copy of the proof of payment made on 26 Oct. I did not receive any response from CSS (Jessica Second).<br> <br> At the end of December when I checked my bank statement I found the CSS had deducted R310 from my account. This was done without any authorisation and without any communication.<br> I had previously cancelled my debit order with CSS because of such unauthorised deductions but in spite of the debit order being cancelled they are still doing it.<br> <br> When I spoke to Jessica today she refused to answer my questions and referred me to her manager Ryan Hope. Mr Hope's response to my objection to the unauthorised and ******** deduction was that 'I should read my contract' and that CSS is entitled to do whatever deduction they want to.<br> How does one deal with a security company that has no regard for legal practices and who treats the client with such arrogance?