Computech credit services, stop messing with me

Computech credit services have been debiting my account without my consent I immediately stopped that, when I investigated I found out that they have been ******** a lot of people .my problem is that I never had any dealings with them, they are now threatening me with legal action and putting me under debt review because of R1,267,60 they are claiming I owe to them for a loan application which I know nothing about and they have never rendered any service on my behalf even SA loan they claim, they negotiated a loan for me I do not have loan with them, all my loans I did an application myself. Computech credit services on 21 and 23 October 2020 sent me an email and sms respectively on the 24 October 2020 they called me I told them they must stop contacting me.