Unauthorised debit order collection

This man and his company has been submitting debit orders for payment from my business bank account and has been doing so for years with no services being used, while I was under the misapprehension it was my internet service provider. When my daughter who is in IT took over hosting my internet business, this came out. This has occurred since before the Consumer Protection Act came out. I have demanded a refund which he is not addressing. Not one apology. No renewal of contract when the CPA came out. In conversation with him when I finally managed to track him down, he said he wondered why the account was not being used - he now denies having said this. I have told him that I will accept a refund from when the CPA came out, amounting to R8690 and not the whole amount which is over R12500 from when the CPA was signed into law. He has not agreed to refund me. This man even **** saying someone had called him for a new password as he was re-setting my adsl modem 18 months or 2 years ago. We have not had any landlines since the Telkom cable was ****** more than 5 years ago. We gave him until 10am today the 9 December to pay - which he has not.