billing for service which I never subscribed to

<br> Good day<br> <br> I received a billing that included a subscription costs.<br> <br> I want to register a complain with Vodacom because I never subscribed for this service.<br> <br> Ever since I took the contract I never sent a single sms from the sim card. How did Vodacom manage to allow the sms subscription on my account with sms being sent / or confirm the subscription.<br> <br> There is no sms that was send from my number confirming this subscription.<br> <br> It looks like my number was randomly subscribed to this service.<br> <br> Please may you investigate this matter urgently. The call center agent has assisted me to cancel the subscription but I want to find out how was this registration activated and I want credit refund for the amount that was debited on the account<br> <br> regards<br> <br> Dinko<br> ***