Mr Price - Sim card

I have bought phone in mr price in April it had two sim card vodacom and mr price sim .I was called about mr price sim card and the lady explained to me how it works. I told the lady that i am not interested in the sim as it is linked to my account because i have bought that phone for my daughter, but she registered the sim even when i have refused to give her permission to register the sim, i was suprised when i see my monthly statement. I want the lady that registered sim card without my permission disciplined.