Unauthorized debit order

I have just had a debit order taken off my account from hollard for R584.68. This was in no ways authorized by me at any time. <br> I enquired telephonically about an extended motor warranty beginning January and as far as I can recall this was the amount quoted.<br> I never submitted my bank details at any time during the telephonic call.<br> I was a previous motor insurance client of Hollards a few years ago, and can only presume that they picked up my details from that. I did supply my ID no to get a quote hence the connection.<br> Who gives these institutions the right to do this. Surely there is a manager or supervisor in these call centres, who checks up on these calls and authorises this.<br>