Slapped with a R54000 data bill

Cell C activated my international roaming for about 8 hours and deactivated it without letting me know due to "high usage". They then slapped me with a R54000 data bill. Speaking to their agents and trying to get a justification for this amount for about 3 hours of data usage was like hitting my head against a brick wall. I eventually managed to get a data usage log out of them and as I thought, their charges were wrong! Charging me for hours while I was flying and my phone l switched off. These charges were also billed before my roaming was even activated! Needless to say, I did not pay the bill and my service has now been suspended. Still waiting for someone to come back to me. Unbelievably shocking service.