Clientele debit from my account without any permission

For no reason Clientele is debiting from my account. I have sent numerous emails. I spoke to a lady, she said its a life insurance. I never app**** for any insurance with them. She said the application was done in a mall. Dont tell me which mall. I told her that I did not complete an application. Where did they got my personal details, my bank account and my signature? This is *****. I only get my R350 sassa and every month they taking it. She said they will cancel my policy and refund me. Still the debit order went through this morning.