Charged R55 / day from Opera Telecom SA (Pty) Ltd

I was unaware that Opera Telecom SA (Pty) Ltd had been charging me R55,00 per day from December 2015 - April 2016 on my Vodacom account for a service that I have never signed up to. (R8,394.43 from December 2015 to date). I called the Vodacom Helpline (082 111) and the consultant told me that you can get a pop up on your phone and even if you decline the offer of there service they still charge you. Vodacom stopped the subscription now, but the consultant told me there is nothing Vodacom can do to stop or refund the payments. I find this totally out of order that Vodacom can allow a company to carry this out. If I don't get any communication from them I will take it further with Vodacom and Opera Telecom. It is unacceptable that Vodacom allow a company to charge me for a service that I never signed up.