What is a call limit for???

I had a limit of +/-R300 on my data account, I changed it now to R200. (What for? I don't know)<br> My account went up to +/-R3000.<br> After my account was blocked, after my bill was R3000 I received smsses stating I am over the limit.<br> All the call centre agents can say is read the small print.<br> <br> This is bull ****!!!<br> Unacceptable!!!<br> <br> My account is still blocked, the call centre can't even help me with that!!!<br> <br> I will make sure all my friend including facebook knows what bunch of ****** you are!!!!!