Unauthorized debit order

Good day I'm very irritated by your company taking unauthorized debit orders on to my account, I was interested in studying with your college but later got something better I spoke to a call centre agant I told them im no longer interested... It's been 2 months now you people are debiting my account for what I don't know, I'm not studying with you, I don't have study materials I have nothing connectinge me with your company please stop this as I'm taking this matter further. I don't owe you anything.