Billing problem

I have a call limit set on my data account, and I know this is in place as the data deal doesn't work after I have use all of the data. But this month I received an account of R2 083.35 and now the person at the call center tells me I don't have a call limit on the account. How is this possible as I cant use any data out of bundle, but the account is accumulating? This month by around the 9th the data was deplete, and i cant use the data anymore.