Lavamobi charge which i did not subscribe to.

Today ive noticed i had money gone from the airtime i just placed on my phone. When i called the consultant said ive subscribed to Lavamobi. I told her i have vodacom for years and never subscribe to any premimium services. I also said i never got any sms to say ive got this services. Vodacom tells me there is nothing they can do its not their problem. My question is as a provider you should've notified me via sms about services ive subscribed to. Not happy ****** *******