Taking money of my account unauthorised

Homechoice debited my account this month, unauthorised for an amount of R605.43. I never signed up or bought anything from them, so no idea where they got my bank details from. But this is clearly wrong and ********** I now had to get it reversed by FNB which is costing me as i need to pay the bank charges to reverse something that is clearly Homechoice's error Please rectify immediately and remove my bank account from your system. Debit reference was HOMECHOICERID ***