INTERNATIONAL ROAMING DISPUTE

Pity there is not a - score as I am so livid right now. I have suddenly been "upgraded" to International calling facilities - despite me not even asking for it. When I asked Cell C to prove to me that I have asked for this facility they revert to the standard I should have asked for International Roaming to be put off prior to departing overseas. I NEVER ASKED FOR IT TO BE ACTIVATED so how do I know to have it switched off - I have traveled overseas 8 times since I first made the mistake of leaving my Data Roaming on (an expensive leaning curve) and therefore have never made that mistake again!!!! ALL I want is Cell C to show (prove) to me where I requested that it be activated. To spite this they cut me off at my requested limit - but when I am overseas they failed to do so. I am at wits end. Is there an ombudsman for cellular telephone disputes.