Out of bundle usage / account limit not enforced

I have a Cell C data account through Autopage, in June I started using the sim in a new tablet. In June and July I unwittinngly ran out of my data bundle since the tablet doesn't recieve sms and cannot make calls so the only way to check my balance is to put the sim in my phone. That was my mistake, but what irks me is that previously I had a limit imposed on my account. A service which I pay R5.51every month.<br> <br> Instead of limiting my account as it should I have racked up 2x bills exceeding R1000. I have paid the first of these and will pay the other, but I am very dissapointed by this service.<br> <br> A discount on my bills would be appreciated, but at the very least I expect my R5.51 spent every month on a service that doesn't work to be credited on my account and the service removed.