EXTRA COSTS I KNOW NOTHING ABOUT!!!

On the 9th of December 2015 i went to mtn capegate and had Na upgrade. i took a package for R159 per mnth AND MY LIMIT SET TO .00. A week later i receive a message saying iv reached my limit and have blocked my outgoing calls. i went in and was told one of the phones, the *** had reached a limit of R800 and in total at the end of the month had to pay R1100!!!!! what the HELL!!!!!. I ONLY SIGNED UP FOR A CONTRACT OF R159 per month!!! IF I WANTED ANYTHING EXPENSIVE I WOULD HAVE SAID SO. WHERE ARE THESE CHARGES COMING FROM. I DID NOT AGREE TO ALL THIS AND MY CONTRACT STATES R159 PER MNTH. AT THE SHOP NO ONE IS HELPING ME ALL THEY SAY IS THEY HAVE NO IDEA WHERE THESE CHARGES ARE COMING FROM. I WAS SERVED BY GIOVANNI AND NOTHING OF THE EXTRA CHARGES WAS EXPLAINED TO ME. I DID NOT AGREE TO THAT!!!MY CONTRACT STATES NOTHING OF THESE CHARGES THEY ARE CLAIMING ARE VALID!!!<br> <br> DISSAPOINTED!!!