MTN are simply ripping us off, period!!!

When are we going to get help from these ******* called MTN. I bought a 48GB this morning, I have not watched any videos but at 02:00pm, 2,5GB is gone. I mean how in the hell is this possible. How do they explain such a massive data going off like that? These guys obviously are ripping us off so that they can pay their executives huge amount of salaries. And where is ICASA in all of this? Busy with the soup I think.