Missing airtime

Today I received a message from Vodacom, that I have purchased a my meg data bundle 100, SUBS bundle valid ubtil 31/05/2015, my account will be debited with 29 rands every month, and I have not even made any subscription to such, I then called vodacom since they deducted my account and they acknowledge that I was not the only person who has encountered the problem from a consultant by a name of Latoya, later on I called and I was answered by Zania and she told me that they can not refund me because I was on the internet of which I was not.