Data Cap / Limit not activated

I had a 2 gig data contract for R99 per month with Nashua Mobile. I also added a limit or cap to ensure that i don't go above my monthly allocation. When Nashua Mobile closed, my contract was moved to autopage and everything was working just fine until this month. I got an email from Autopage on 14 July 2015 stating that my unbilled usage for the month was R5255.65 and my service had been temporarily suspended. I called the call center to confirm what was going on because i had a cap from the beginning so i couldn't understand why the cap / limit had not kicked-in as soon as the monthly allocation (2 gig) had been used up. The agent argued with me stating that their limit service was not always accurate and i had to pay the R5255.65 . <br> <br> I feel this is absolutely unacceptable that such things happen and are pinned onto the customer when their systems are the ones that are not up to scratch. This is unfair business practice