Unauthorised debiting of subscription( Air G)

Your recurring R7.00 Subscription to AirG Social Service will be billed on ***. To unsubscribe click (some obscure Vodafone url).<br> <br> I have not subscribed nor would I for any such service. So I view this as an unauthorised and unsolicited spam.<br> <br> Please advise what this **** is.This has been debited for numerous months and I want to be refunded.<br> <br> EVERY WEEK THEY ARE *****ING R7.IT ADDS UP.I WANT MY MONEY REFUNDED.<br> <br>