Unauthorised debit

On 16 Feb 2016 an amount of R99 was ********ly debited from my account. I visited the local branch of my bank to sort the issue out. They told me that a company whose CEO is Jeremi de Bruin had debited my account. They gave me the phone number as ***. I called the number and a lady told me they had processed the debit order on behalf of Amkay Trading whose phone number is ***. When i phoned the number I did not get straight answers. My concern is I have never done business with either company and am wondering where they got my account details from. Is my money safe?