Data allocated incorrect

I called the call centre after my line was unlocked to enquire why my data was depleted only to be told I was allocated with 2GB of data. I enquired what happened to the data that was allocated on the 21-09-2015, the consultant said that it was used. I asked her how was it used because my line was locked when that data was allocated. She was not able to give me an explanation she said her Team Leader will call me. A team leader attempted to call me once after that an sms saying I must rate their service came through. I made a payment on the 31-08-2015 however my lines were not reconnected. I stayed without data I made my payments again and requested my lines to be connected only to be allocated with 2GB of data. My data carries over to the last day of the next calender month what happened to the data that was allocated on 21-09-2015 seeing that upon calling the call centre I was told that it was used irregardless of the fact that the line was locked.