*******ly deducting money off my MTN account

My MTN bill shot up by a R100 under an item of \CONTENT CHARGE\" on my bill. When I phoned MTN they said it was due to me been out of my contract period thus they are levying this charge. Three months later and now the content charge is R200 I phoned MTN who now disclosed to me that I subscribed to VIDEOS with OPERA TELECOM. This comes as an utter shock as I have never subscribed to them but they are just taking money from my account. MTN says they are not responsible but they are allowing this to go through my account *******ly.<br> I am now concern as apart from not getting my money back they are at liberty to ***** from me whenever it suites them and I have no recourse to get my money back."