Unauthorized charges on my account

I received my bill and realized that I am being charged for subscriptions that I never signed up for, R2200 per month, I phoned customer service and asked why I am being billed for these, I was told that they don’t know, when I asked how these so called service providers got my number to bill me, I was told this automatically happens when I use the internet, how ludicrous! I also have charges for buying data that I never made, 12 x 1g/2g data bundles that I never bought! I was told that I bought these on *111# but these calls don’t reflect on my detailed bill! This is a ****!