WORST SERVICE EVER!!!!!!

I set up a call limit of R150 on my cell phone. I receive an sms stating that I'm over by R2000, so I phone the call center. The consultant keeps me on hold for almost 10minutes and then immediately starts of by saying I should remember the T&C's stated Glocell does not guarantee the accuracy of this limit. I understand going over by R200/R300, but seriously, R2000?????? So of course I loose my temper and request to speak to a supervisor, she keeps me on hold for another 10minutes. WHAT IS THE POINT OF ACTIVATING A CALL LIMIT IF IT IS NON EXISTENT?????